主链型光敏聚酰亚胺材料的制备工艺研究

本文通过溶液聚合法合成了一种结构型聚酰胺酸,经过热亚胺化处理后得到了主链型聚酰亚胺,探讨了合成光敏聚酰亚胺的关键技术,并以重均分子量为参考,分析了各种条件对反应的影响规律,得到了较佳的工艺条件。     

Characterization of surface grooves and scratches induced by friction of C/C composites at low and high temperatures

Friction experiments were conducted on C/C composites at low and high temperatures during braking with the use of a pin-on-disc tribometer. The surface grooves formed were investigated by an optical camera and a laser profilometer, while scratches were characterized by optical microscopy. Damages were correlated with tribological performances (friction and wear). It is shown that friction at low temperature leads to high friction coefficient and wear rate, and to surfaces strongly grooved and abraded. For friction experiments performed at high temperature, they lead to lower friction coefficient and wear, and the resulting surfaces are rather smooth and slightly grooved.     

Lipid changes during long-term storage of canned tuna (Thunnus alalunga)

 Lipid damage during prolonged storage of canned fish was studied. Albacore tuna was processed under two sterilization conditions (115°C, 74 min; 120°C, 40 min) and then stored for up to 6 years. Analyses (lipid oxidation and hydrolysis, browning and formation of fluorescent compounds) of the lipids extracted from the white muscle of the fish and the packing oils were carried out. Muscle lipids were partially extracted by the packing oil, so that an increase in the storage time produced higher levels of free fatty acids, browning and fluorescence development in the packing oils. As regards the types of muscle, little difference between them throughout the canned storage was detected. Received: 17 February 1997 / Revised version: 12 May 1997     

新型光敏聚酰亚胺微型阀

微型阀是微流体测量系统的重要组成部分，本文提出了一种微型光敏聚酰亚胺被动阀，分析了该材料性能，叙述了微型阀的特点、结构设计和工艺流程，并讨论了加工过程中的一些关键技术。     

地铁车厢火灾探测器选择研究

分析地铁和地铁车厢火灾特点及其引发的严重后果;探讨地铁车厢中火灾探测器的选择;分析比较点型感烟探测器和吸气式感烟火灾探测器在地铁车厢中应用的优劣势;得出吸气式感烟火灾探测器更能满足地铁车厢中早期火灾探测需求的结论。     

Effects of heavy ion irradiation on ultra-deep-submicron partially-depleted SOI devices

The effects of the physical damages induced by heavy ion irradiation on the performance of partially-depleted SOI devices are experimentally investigated. After heavy ion exposure, different degradation phenomena are observed due to the random strike of heavy ions. A decrease of the saturation current and transconductance, and an enhanced gate-induced drain leakage current are observed, which are mainly attributed to the displacement damages that may be located in the channel, the depletion region of the drain/body junction or the gate-to-drain overlap region. Further, PDSOI devices with and without body contact are compared, which reveals the differences in the threshold voltage shift, the drain-induced barrier lowing effect, the transconductance and the kink effect. The results may provide a guideline for radiation hardened design.     

布线图案导致的集成电路平坦化损伤研究

使用化学机械抛光(CMP)的方式,对商用芯片进行拆解,获得了不同制造工艺的铜/低k介质互连结构样品。通过对所获得的32 nm制造工艺的铜/低k介质互连结构样品进行进一步的化学机械抛光实验来研究抛光过程中出现的损伤。实验结果发现,抛光压力过大和过小分别会造成宏观缺陷和导线腐蚀,互连线的分布会导致导线自身的碟型缺陷、不同图案布线结构交界两侧明显的表面高度差异以及同一图案布线结构内部的表面周期性高度起伏。这种表面高度差异可以通过预补偿的方式得到一定的改善。     

感光性浆料法制作PDP电极的工艺

对利用感光性浆料制作ACPDP电极的工艺进行了研究，获得了良好结果，并对研究中遇到的一些问题进行了分析和讨论。     

Nonlinear failure prediction of concrete composite columns by a mixed finite element formulation

This study focuses on developing a mixed frame finite element formulation of reinforced concrete and FRP composite columns in order to give more accuracy not only to predict the global behavior of the structural system but also to predict the local damage in the cross-section. A hypo-elastic constitutive law of concrete is presented under the basis of a three-dimensional stress state in order to model the compressive behavior of confined concrete wrapped with FRP jackets. To predict the nonlinear load path-dependent confinement model of FRP-confined concrete, the strength enhancement of concrete was determined by the failure surface of concrete in a tri-axial stress state, and its corresponding peak strain was computed by the strain-enhancement factor proposed in this study. The behavior of FRP jacket was modeled using the two-dimensional classical lamination theory. The flexural behavior of concrete and composite members was defined using a nonlinear fiber cross-sectional approach. The results obtained by developed mixed finite element formulation were verified with the experiments of concrete composite columns and also were compared with a displacement-based finite element formulation. It is shown that the proposed formulation gives e more accurate results in the global behavior of the column system as well as in the local damage in the column sections.     

碱溶性光敏有机硅聚氨酯丙烯酸酯光固化膜的性能研究

设计合成了一种碱溶性光敏有机硅聚氨酯丙烯酸酯(Alkali-soluble polysiloxane urethane acrylate,APSUA),以期用于阻焊油墨.详细研究了体系组成对APSUA体系的耐水性、体积收缩、硬度、拉伸性能及耐热性能的影响.研究发现:含羟基活性单体会使体系吸水率上升;随着体系交联度增加,...