飞秒激光行波泵浦BBO晶体光参量放大

采用飞秒钛宝石激光放大器二次谐波为泵浦源，行波泵浦ＢＢＯ晶体光参量放大器，获得了可调谐输出（０．４４～２．６μｍ），最大输出能量约４０μＪ／脉冲，测量了参量激光的调谐特性、能量分布和线宽，理论与实验符合较好。     

Ti,Nb复合添加IF钢热模拟过程中的析出行为

对Ｔｉ，Ｎｂ复合添加的ＩＦ钢进行再加热、热轧及卷取等过程的热模拟实验，用透射电镜和定量金相分别进行样品中Ｔｉ，Ｎｂ析出物的观察和粒度分析。结果表明，Ｔｉ的碳、氮化物先天Ｎｂ的碳、氮化物析出，析出过程主要在热轧时进行；在卷取及冷却过程中析出物长大，但在此过程中并不能清楚地看出有新的析出物产生。     

透明导电氧化物薄膜的新进展

透明导电氧化物（TCO）薄膜In2O3:Sn和SnO2:F都已经发展成熟，分别大规模应用于平板显示器和建筑两大领域。最近几年，TCO薄膜的研究又进入了一次复兴时期，研究和开发出几类具有明显特色的新型TCO薄膜。ZnO基TCO薄膜有替代In2o3:Sn薄膜的趋势；多元TCO薄膜材料可以调整其性能来满足某些特殊应用的需求；具有高载流子迁移率的In2O3：Mo薄膜为进一步提高TCO薄膜的性能打开了一条新路；真正的p型TCO薄膜为制造透明电子元器件迈出了第一步。     

^153Gd骨密度计源的研制

本文介绍了生产~(153)Gd骨密度计源的原理、工艺和结果。采用天然Eu_2O_3作靶材料,汞阴极电解法分离得的~(153)Gd,经压制、烧结法制成源芯体。源的活度>3.7×10~10Bq,放射性核纯度>99.99%。     

对二甲苯增产技术发展趋向

综述了国内外芳烃联合装置中甲苯歧化与烷基转移工艺、甲苯择形歧化工艺和重芳烃脱烷基工艺近年来技术进展情况,并分析了各种技术的优势与不足之处。提出了未来增产二甲苯工艺技术发展的趋向,指出甲苯歧化与烷基转移技术今后发展的重点是高空速、低氢烃比、高选择性和加工更多C9+A的催化剂的研究开发;甲苯择形歧化与苯／C9A烷基转移组合工艺具有降低生产成本、增产对二甲苯的技术优势,期待实现工业化;甲苯甲醇甲基化制高浓度对二甲苯技术,随着天然气化工的发展具有良好的应用前景,值得关注。此外还简述了具有前瞻性的对二甲苯合成新技术的研究开发进展。     

地下室防水新理念与技术的成功实践

本文介绍了地下室防水设计、施工的一些新理念和新技术,并将其应用到实际工程中,工程实践结果表明:这些防水新理念与技术的联合应用是经济、高效地解决地下室防水问题的有效途径,具有较高的推广价值。     

Translucent PMN and PMN-PT ceramics from high-energy ball milling derived powders

Translucent PMN and PMN-PT ceramics were prepared from nano-sized powders produced by a high-energy ball milling process. A two-step process was used to achieve the translucent PMN and PMN-PT ceramics, in which samples were sintered at 950°C for 1 h at first and then annealed at 1100°C for 6-24 h. Transmittances at 600 nm wavelength of the PMN, PMN-0.10PT and PMN-0.35PT ceramics annealed for 12 h were 21, 16 and 11%, respectively. The formation mechanism of translucent PMN and PMN-PT ceramics in the present work is similar to that of transparent PLZT ceramics.     

Characterizing the viscoelastic properties of thin hydrogel-based constructs for tissue engineering applications.

We present a novel indentation method for characterizing the viscoelastic properties of alginate and agarose hydrogel based constructs, which are often used as a model system of soft biological tissues. A sensitive long working distance microscope was used for measuring the time-dependent deformation of the thin circular hydrogel membranes under a constant load. The deformation of the constructs was measured laterally. The elastic modulus as a function of time can be determined by a large deformation theory based on Mooney-Rivlin elasticity. A viscoelastic theory, Zener model, was applied to correlate the time-dependent deformation of the constructs with various gel concentrations, and the creep parameters can therefore be quantitatively estimated. The value of Young's modulus was shown to increase in proportion with gel concentration. This finding is consistent with other publications. Our results also showed the great capability of using the technique to measure gels with incorporated corneal stromal cells. This study demonstrates a novel and convenient technique to measure mechanical properties of hydrogel in a non-destructive, online and real-time fashion. Thus this novel technique can become a valuable tool for soft tissue engineering.     

Study on preparation and fire-retardant mechanism analysis of intumescent flame-retardant coatings

An intumescent flame-retardant coating was prepared by unsaturated polyester resin and epoxy resin as two-component matrix resins, ammonium polyphosphate (APP) as acid source, melamine (Mel) as the blowing agent and pentaerythritol (PER) as carbon agent, expandable graphite as synergistic agent, adding titanium dioxide (TiO₂), solvent and other assistants. Results showed that such a coating had excellent physical-chemical properties. When the thickness of the coating on the wood matrix reached 2.0 mm, the limit of fire-endurance could get to 210 min. And the various component thermal characteristics, decompose processes and interactions of the flame-retardant coating system were investigated by DSC and TGA. The contribution of phosphorus to the formation of the final charring layer and their morphological structures was studied by SEM, XRD and FTIR. On the basis, the flame-retardant mechanism of the intumescent flame-retardant coating was systematically investigated.