聚合物混合状态检测中信号特征提取技术研究

针对螺杆挤出机中聚合物挤出过程的混合状态的在线检测要求,研究聚合物混合状态的超声波脉冲检测的特征信号的提取技术。通过研究超声波在聚合物中的速度和能量的衰减,推测分散在基体中的分散状态等混合物的状态。实验表明：通过差分法提取聚合物混合物和单一聚合物的特征信号,可以明显提高特征值的精确度,获得较好的效果。本文为聚合物混合状态在线检测特征信号的提取提供方法参考。     

用于聚合物光纤的稀土离子配合物光谱特性研究

采用三种配体苯甲酰丙酮(BA)、苯甲酰三氟丙酮(BFA)、α-噻吩甲酰三氟丙酮(TTFA)与EuCl3和SmCl3合成了六种二元配合物Eu(TTFA)3,Eu(BA)3,Eu(BFA)3,Sm(TTFA)3,Sm(BA)3,Sm(BFA)3,通过测试比较其荧光光谱发现Eu(TTFA)3,Eu(BA)3,Eu(BFA)3在618nm处产生很强的荧光;Sm(TTFA)3,Sm(BA)3,Sm(BFA)3在650nm处有荧光峰产生;通过分析配合物和配体的能级关系,不同配体间发光效率的差异,不同稀土离子的发光特性的差异,发现了TTFA是Sm3 和Eu3 的优良配体,Eu3 具有较高的发光效率。在Sm3 和Eu3 的共掺杂中,选取TTFA做配体,发现Sm3 对Eu3 有明显的敏化效应。     

Noise characteristic of dye-doped polymer optical fiber amplifiers

The noise in polymer optical amplifiers is mainly derived from the amplification of spontaneous emission （ASE）. ha this paper, the noise characteristic of dye-doped polymer optical fiber amplifiers is studied. The propagation equations of ASE power and the rate equations of dye molecular concentration are found based on the energy level transition of dye. The noise characteristic of optical fiber amplifiers is given by solving above equations numerically, and the relationship between noise figure and parameters of optical fiber amplifiers is investigated in detail. The result shows that the noise figure of dye-doped polymer optical fiber amplifiers will not exceed 5 dB.     

CVDZnS微观缺陷分析

微缺陷对化学气相沉积硫化锌(CVDZnS)的光学及力学性能有显著影响。对沉积工艺进行了介绍，通过SEM、TEM及金相对CVDZnS中的微缺陷如异常大晶粒、柱状晶、微裂纹、微孔及杂质的结构形态进行了观测，并对形成原因进行了分析:高的沉积生长速率是生成异常大晶粒的主要原因；反应物浓度高加之衬底表面的屏蔽效应及Zn/ H2S1形成结构疏松的柱状晶组织；沉积温度较低加大沉积生长应力，宏观上产生材料的起拱，微观上造成晶粒的弯曲形变，并在晶体内产生大量微裂纹；沉积室局部反应物浓度高导致微孔及杂质的产生，须改善沉积室气体流形提高反应物浓度的均匀性。     

Small antenna location synthesis using characteristic modes

It is shown that the efficiency of a small antenna can be substantially increased by properly locating it on its support structure. Characteristic modes are used to determine the optimum location and frequency.     

不锈钢毛细管和聚合物联合增敏的高频FBG加速度传感器

为了适应于变压器的内部振动监测的需要,提出 了一种不锈钢毛细管和聚合物(Polymer)相结合的高 频光纤布拉格光栅(FBG)加速度传感器。利用有限元分析了 不同毛细管厚度 和多种聚合物填充下传感器的静态与动态特性,根据仿真参数研制了振动传感器,并通过 振动台实验对 其灵敏度以及幅频特性作了实验测试。实验结果表明:选择有机玻璃(PMMA)为聚合物填充 材料时,毛细管厚分别为0.1、0.2和0.3mm时,传感器谐振频率分别为1000050和 1100 Hz,灵敏度分别为32和18pm/g;选择环氧树脂为聚合物填充材料时,毛细管厚分别为0.1和0.3mm时,传感器谐振频率分别 为900000和 1050Hz,灵敏度分别为35、29和20pm/g。     

从微观宏观来看韩国移动广播与通信的融合

1前言随着广播的数字化,在广播与通信融合的命题下,最为引起广播业界注目的以手机为中心的移动广播市场正在兴起。本文将根据日刊“卫星与CATV杂志”(06-10期)所报道2006年9月于东京召开的有关世界移动广播的情况,对其先行者韩国的移动广播研讨会的动向作一介绍。本文分两部分:第1部分是从宏观来看韩国移动广播的政策与产业界的动向及展望,第2部分是从微观来看的实际业务与通信界市场的动向。     

Electrochemical synthesis and electrochromic application of a novel polymer based on carbazole

The compound containing carbazole and thiophene, named as B1 was synthesized with 4-(9H-carbazol-9-yl) phenol and 3,4-dibromo thiophene. Additionally, the electrochemical polymer of B1 was synthesized and coated onto an ITO-glass surface via electrochemical oxidative polymerization. The electrochemical synthesis of the polymer was performed both in 0.05 M LiClO₄ supporting electrolyte in AN/BF₃EtE (1:1, v/v) and an AN/LiClO₄ solvent/electrolyte solution. The compounds were characterized by FT-IR and NMR techniques. The spectroelectrochemical and electrochromic properties of this polymer were also investigated for two electrolyte solution systems. The switching ability of this polymer was measured as the percent transmittance (%T) at its point of maximum contrast. According to the electrochromic measurements, the synthesized polymer had a blue color when it was oxidized, and also when it was reduced, it had a transparent color. Additionally, redox stability measurements indicates that the polymer had a high stability and it could be used to produce new polymeric electrochromic devices and also, it was a good candidate for electrochromic devices (ECDs) applications.     

Validation of opposed two-diode equivalent-circuit model for S-shaped characteristic in polymer photocell by low-light characterization

The opposed two-diode equivalent-circuit model consisting of a traditional one-diode photocell model and a parasitic diode with a parallel resistance is known to somehow reproduce the S-shaped current-voltage curve of poor organic photocells. Here, the light-intensity dependencies of the parameters in the model are experimentally studied. On the assumption that the parasitic part is light-insensitive, the parameters of the main part, which are extracted by fitting the current-voltage curves under various illumination intensities with the model, are found to change as those of healthy photocells do. The reasonable separation of light-sensitive main and light-insensitive parasitic parts validates the model.     

Design and synthesis of soluble dibenzosuberane-substituted fullerene derivatives for bulk-heterojunction polymer solar cells

Two new dibenzosuberane-substituted fullerene derivatives, dibenzosuberane-C₆₀ mono-adduct (DBSCMA) and bis-adduct (DBSCBA) were synthesized using a classical cyclopropanation reaction via a tosylhydrazone route for application as acceptor materials in polymer solar cells (PSCs). DBSCBA shows good solubility in common organic solvents and both derivatives were characterized by ¹HNMR, ¹³C NMR, MALD-TOF, elemental analysis and UV–vis absorption measurements. The shift of fullerene energy levels induced by the dibenzosuberane substitution was investigated by using theoretical simulations and ultraviolet photoelectron spectroscopy. Bulk-heterojunction PSCs based on poly (3-hexylthiophene) (P3HT) and dibenzosuberane-C₆₀ derivatives were fabricated and optimized by adjusting the donor/acceptor ratio and using thermal annealing and solvent additive. The morphologies of the active layers processed under different conditions were also examined by atomic force microscopy. When tested under an illumination of AM 1.5 G at 100 mW/cm², the highest power conversion efficiency of the devices using DBSCBA is 3.70% which is superior to that of conventional P3HT:PCBM devices.