50~100 μm太赫兹成像物镜设计

根据太赫兹探测成像用户的需求,设计了一种适用于太赫兹波段的光学系统。其焦距为50 mm,F数为1,工作波段为50~100μm,接收器为非致冷型IRM160A红外探测器,全视场角为11.9°。该系统采用共轴式结构,由3片球面透镜和1片CCD保护玻璃组成,并使用了Topas COC新型材料。另外还引入了1个非球面,以实现系统结构简单、重量轻和成本低的目标。设计结果表明,当截止频率为10 cy/mm时,该光学系统的调制传递函数接近衍射极限,各个视场的点列图均方根半径均远小于艾里斑半径,并具有良好的成像质量,因此能够满足太赫兹光学系统的总体设计要求。     

茂金属聚烯烃的特性和应用

从90年代初以来应用茂类金属化合物催化剂体系合成聚烯烃的技术在很多公司进入工业化生产阶段,随之其加工性能研究和产品开发工作也进展很快.茂金属聚合物的特性引起人们的广泛关注,关于茂金属聚合物的信息和报道越来越多.本文选取了从1992年～1997年间的部分文献,综合介绍了茂金属聚合物(sPP、m-LLDPE、PS、和COC等)的物理性能、加工特性和产品应用的基本情况.     

A modified quasi‐creep model for assessment of deformation of topas COC substrates in the thermal bonding of microfluidic devices: Experiments and modeling

The effects of thermomechanical properties of dissimilar polymer plates on thermal bonding were investigated and the resultant deformation of cover Topas COC plate was modeled using a simplified quasi‐creep model. The appropriate conditions for thermal bonding for minimal deformation of both the Topas cover and substrate plates could be established through simulation using the quasi‐creep model. Both the cover plate and the substrate containing microchannels were fabricated by injection molding. The elastic modulus of the COC plate at different temperatures was measured using three‐point bending test. The thermal bonding was conducted at different temperatures, pressures, and holding times. The deformation of the cover plate (consisting of Topas with a lower glass transition temperature, T_g) into the microchannel of the substrate plate (consisting of Topas with a higher T_g) was found to be significant even at lower bonding pressures when the bonding temperature was higher than a critical temperature. Such deformation was dependent on the viscoelastic creep behavior of the material and the thermal bonding temperature and load. This deformation behavior was predicted by the numerical model, and the predicted results agree well with the experimental data. The bonding strength of the sealed microchannels was evaluated using the burst test. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Low-voltage organic transistors and inverters using HfOx dielectrics

Based on the p-type pentacene and n-type N,N′-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDI-C13), low-voltage organic field-effect transistors (OFETs) and inverters using hafnium (Hf)-based dielectrics were produced and characterized. All the pristine and cyclic olefin copolymer (COC)-passivated HfO_x gate dielectrics were deposited by the solution-processed sol–gel chemistry, and organic thin films were deposited on the dielectrics by the neutral cluster beam deposition method. In comparison to the pristine HfO_x-based OFETs, the COC-passivated transistors showed better device performance: higher hole and electron mobilities, reduced hysteresis, decreased trap densities, and particularly improved operational stability of n-type transistors. The inverters composed of the optimized p- and n-type OFETs with the asymmetric Au and LiF/Al electrodes using COC-passivated HfO_x dielectrics exhibited high gains and good noise margins under ambient conditions.     

低损耗传输太赫兹波的Topas多孔纤维设计

以新型聚合物材料Topas环烯烃共聚物（COC）为基质,设计了一种能够低损耗传输太赫兹波的多孔纤维。应用全矢量有限元方法对传输特性的研究结果表明,该Topas多孔纤维在太赫兹波段具有宽带低损耗、低色散的特性:0.4~1.5 THz范围内的损耗小于0.2 cm-1;0.48~1.5 THz范围内的色散为1.80.3 psTHz-1cm-1。所设计的多孔纤维兼顾了结构简单、易于制备的特点。研究结论为Topas太赫兹波导的制备提供了理论指导。     

Device characteristics of perylene-based transistors and inverters prepared with hydroxyl-free polymer-modified gate dielectrics and thermal post-treatment

Organic field-effect transistors (OFETs) and complementary inverters were produced on the basis of n-type N,N′-dioctyl-3,4,9,10-perylene tetracarboxylic diimide (PTCDI-C8) using the neutral cluster beam deposition (NCBD) method. Significant improvements in surface morphology and crystallinity were observed after the surface modification of SiO₂ gate dielectric layers with hydroxyl-free polymer insulators such as polymethylmethacrylate (PMMA) and cyclic olefin copolymer (COC), and thermal post-treatment. Electric characteristics and operational stability of PTCDI-C8-based OFETs were also clearly enhanced after the surface modification, and in particular, the thermally post-treated OFETs with COC-modified SiO₂ gate dielectrics exhibited a high room-temperature mobility of 0.68 cm²/V s. Two structural types (generic vs. encapsulated) of inverters in top-contact configuration were fabricated by integration of the p-type pentacene and n-type PTCDI-C8 OFETs using COC-modified SiO₂ gate dielectrics. Due to the increased electron mobilities and good coupling between p- and n-type OFETs, hysteresis-free, fast-switching inverters were realized with high gains of ∼20 in the first and third quadrants of voltage transfer characteristics under ambient conditions. The device characteristics of the encapsulated inverters monitored as a function of the time were well maintained with slight degradation.     

丙硫克百威及其代谢物在气相色谱分析中分解因素的探讨

采用气相色谱法（GC—NPD和GC—MS）同时测定丙硫克百威及其主要代谢产物克百威、5-羟基克百威。利用程序升温气化进样器（PTV）的不分流模式进样和冷柱头（COC）柱上直接进样模式，比较了气化温度和进样方式的改变对氨基甲酸酯农药在GC分析时分解行为的影响。结果表明，采用柱上进样方式比降低气化温度，更利于抑制氨基甲酸酯农药的分解。     

乙烯/降冰片烯共聚物的合成及其结构

针对环烯烃与α-烯烃共聚合而成的热塑性工程塑料催化剂的选择,文采用β-二亚胺钛催化剂合成了乙烯与降冰片烯的共聚物,进行了其微观结构和催化机理研究.研究结果表明,β-二亚胺钛催化剂能够很好地催化乙烯与降冰片烯的共聚合.通过对合成的共聚物的微观结构的分析发现,钛催化剂合成的乙烯/降冰片烯共聚物以无规结构为主,共聚物中出现了降冰片烯的二聚和三聚序列结构.共聚合机理的研究也表明该催化剂有利于合成乙烯与降冰片烯的无规共聚物.     

玻璃瓶装碳酸饮料HACCP体系的建立

按照食品法典委员会推荐的HACCP导则，建立食品安全管理体系。结合碳酸饮料生产过程控制经验进行各步骤危害分析，制订监控措施，使HACCP理论在玻璃瓶装碳酸饮料生产至储运过程得到应用。     

基于功率和倾角联合优化的小区中断补偿机制

为了实现对中断小区的自主补偿,该文基于自组织网络(SON)提出功率和倾角联合优化调整的小区中断补偿(COC)机制。首先以天线倾角和发射功率作为优化对象,然后对COC定义了合理的优化目标及评价指标,并对优化模型进行分析,最终给出基于遗传优化算法的补偿机制。在分时长期演进(TD-LTE)场景中进行仿真验证,该机制与参考文献中的3种算法相比,在覆盖、干扰和吞吐量等方面均有明显的改善。