霍山石斛酵素发酵过程中抗氧化性能的变化

以霍山石斛为原料，研究发酵过程中活性成分(总酚、总黄酮、总酸)及体外抗氧化性能(ABTS自由基清除能力和羟基自由基清除能力)的变化规律。通过Spearman分析确定发酵过程中活性成分变化与体外抗氧化性能的相关性。以WRL-68人正常肝细胞构建氧化应激模型，探究发酵前、后样品处理细胞相关抗氧化酶活力的变化。结果表明:发酵前、后霍山石斛酵素总酚和总黄酮含量分别增加35.5%(P＜0.05)和49.1%(P＜0.05)，ABTS·和·OH清除能力分别提高了31.1%(P＜0.05)和26.3%(P＜0.05)。前者与总酚(P＜0.05)、总酸(P＜0.05)含量呈正相关，后者与总酸(P＜0.05)、总黄酮(P＜0.05)含量呈正相关。使用双氧水构建WRL-68人正常肝细胞氧化应激模型，酵素组干预后胞内活性氧自由基(ROS)水平显著降低，且相关抗氧化酶系过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GSH-Px)和超氧化物歧化酶(SOD)活力上升。结论:霍山石斛酵素发酵前、后活性成分和抗氧化能力显著提升，抗氧化能力的提升与发酵过程中酚酸类和黄酮类物质的增加呈显著正相关，发酵后比发酵前具有更强的WRL-68细胞氧化应激防护能力。     

适应频繁波动特点的移动话务量预测系统

移动通信话务量的时间序列具有较强的非线性和随机性，易受各种突发情况的影响。特别是在有频繁剧烈变动的情况下，很难用传统的预测方法进行预测。本文根据移动通信话务量的这一特点，采用分解及建模的方法，对话务量进行综合预测，经实践可以达到更好的效果。     

连铸保护渣的绝热保温性能

提出了描述连铸保护渣绝热保温性能的综合评价指数JRBW，其物理意义可理解为单位时间内单位长度上渣层中的温差变化。随着配碳量的增加，JRBW逐渐增大，连铸保护渣的绝热保温性能逐渐好转，连铸保护渣的渣粒形状对其绝热保温性能影响显。     

金属跌落零件冲击响应信号的时频分析

分别研究了用平滑Wigner分布和小波变换分析跌落零件冲击信号的方法，比较了各种分析方法的特点。结果表明，这些时频域分析方法有很多优越性，但是也存在一些有待进一步研究的问题。     

Crystallization and wetting of ZnO-Al2O3-B2O3-SiO2 glass-ceramic for sealing to Kovar alloy

A new type of ZnO-Al₂O₃-B₂O₃-SiO₂ glassceramics seals to Kovar in electronic packaging was developed, whose coefficient of thermal expansion (CTE) and electrical resistance were 5.2 × 10⁻⁶/°C and over 1 × 10¹³ Ω·cm, respectively. The major crystalline phases in the glass-ceramics seals were ZnAl₂O₄, ZnB₂O₄ and NaSiAl₂O₄. The dielectric resistance of the glass-ceramic could be remarkably enhanced through the control of the alkali metal ions into the crystal lattices. It was found that the crystallization happened first on the surface of the sample, leaving the amorphous phase in the inner parts, which makes the glass suitable for sealing. The glass-ceramic showed better wetting on the Kovar surface, and sealing atmosphere and temperature showed great effect on the wetting angle. Strong interfacial bonding was obtained, which was mainly attributed to the interfacial reaction between SiO₂ and FeO or Fe₃O₄. This paper was presented at 2008 MRS International Materials Research Conference and won the student best paper award of the conference.     

镀银过程中光亮剂的电极行为

通过阴极极化曲线，微分电容曲线以及ＸＲＤ，ＳＥＭ分析，研究了光亮剂在脉冲及直流电镀银过程中的作用。结果表明，光亮剂在直流与脉冲电镀时的电极行为基本一致，光亮剂Ａ具有去极化作用，并使微分电容增大，光亮剂Ｂ具有增加阴极极化，降低微分电容的作用。     

陆相层序地层研究中几个问题的探讨

从层序地层学的本质出发,结合渤海海域油田研究实际,对层序地层划分与对比的本质、三级层序内部划分问题以及不同体系域三角洲砂体沉积特征进行了探讨,认为搞清研究区沉积环境变化规律是进行层序地层研究的根本,三级层序内部划分必须重视直接反映沉积环境变化的古生物资料;正确认识层序地层、古地貌、物源之间的关系是搞清三角洲砂体沉积特征的关键;只有搞清砂体沉积特征分布规律,才会对不同体系域、不同类型的隐蔽圈闭具有更清晰的认识,从而为隐蔽油气藏勘探提供有益的启示与参考。     

The effect of image potential on electron transmission and electric current in the direct tunneling regime of ultra-thin MOS structures

The direct tunneling current through ultra-thin gate dielectrics is modeled by calculating the transmission coefficient of an idealized potential barrier that is modified by the image force. A numerical solution to the Schrödinger equation shows that the barrier lowering induced by image-potential affects the tunneling current largely. An analytical expression for the current is obtained within the Wentel–Kramers–Brillouin approximation. The effects of image force on the direct tunneling current are found to increase with the applied voltage across oxide (V_ox) and to decrease with the oxide thickness (T_ox).     

Synthesis of rambutan-like hybrid nanospheres of Au-P123

A simple method to prepare the rambutan-like hybrid nanospheres of Au-P123 is presented. The rambutan-like hybrid nanospheres of Au-P123 were characterized by transmission electron microscopy (TEM), Electron diffraction patterns and UV-vis absorption spectroscopy.     

Construction Process Reengineering by Integrating Lean Principles and Computer Simulation Techniques

A construction process reengineering framework and its corresponding methodologies have been developed by integrating lean principles and computer simulation techniques. Instead of classifying activities into value-adding and non-value-adding activities, or into conversion and flow activities as is common in lean production practices, this framework classifies activities into main and supportive activities and/or into normal and interactive activities. This classification makes it more effective in modeling the construction workflow and reengineering the construction process. It also avoids the confusion of the classification of activities into value-adding and non-value-adding activities encountered in the construction industry. In addition, computer simulation techniques are incorporated into the framework to virtually simulate and assess the efficiency and effectiveness of the reengineered construction process that is achieved based on lean principles. Simulation makes it easier to quantify and assess the effectiveness and efficiency of the reengineered construction process.