基于0.35 μm高压CMOS工艺的横向线性雪崩光电二极管

提出了一种基于0.35 μm高压CMOS工艺的线性雪崩光电二极管（Avalanche Photodiode, APD）。APD采用了横向分布的吸收区-电荷区-倍增区分离（Separate Absorption, Charge and Multiplication, SACM）的结构设计。横向SACM结构采用了高压CMOS工艺层中的DNTUB层、DPTUB层、Pi层和SPTUB层,并不需要任何工艺修改,这极大的提高了APD单片集成设计和制造的自由度。测试结果表明,横向SACM线性APD的击穿电压约为114.7 V。在增益M = 10和M = 50时,暗电流分别约为15 nA和66 nA。有效响应波长范围为450 ~ 1050 nm。当反向偏置电压为20 V,即M = 1时,峰值响应波长约为775 nm。当单位增益 （M = 1） 时,在532 nm处的响应度约为最大值的一半。     

基于机器视觉的织物经线偏移检测方法

针对我国印染行业一直以来人工扒幅退捻,工效低,劳动强度大的难题,提出了基于机器视觉的经线偏移的检测方法,大大提高退捻效率与精度.利用CCD摄像机获取织物的图像,对获取的图像进行Blob分析,分析的主要流程包括:图像的提取,分割图像(初始分割、形态学处理等),特征提取.通过实验表明,该方法可以检测出经线的偏移的角度,且有很高精度,可用于立式退捻开幅机.     

Effect of preparation conditions on the characteristics of exfoliated graphite

Exfoliated graphite (EG) was prepared from graphite intercalation compounds (GICs) synthesized electrochemically with different electricity consumption from 10.83 to 40.00 A h/kg. Effects of electricity consumption on the synthesis of GICs and of exfoliation temperature on different parameters of EG, i.e. exfoliation volume, volatile content, specific surface area and pore volume measured by mercury porosimetry, length and width of worm-like particles, and distance between neighboring balloons based on the zigzag model for worm-like particles of EG, were studied. These parameters were found to depend strongly on the electricity consumption and also on exfoliation temperature. Exfoliation volume, volatile content, specific surface area and pore volume on EG prepared at 1000 °C increased with increasing electricity consumption, but the distance between neighboring balloons was found to decrease. These results reveal marked development of pores in EG samples. Raising exfoliation temperature increased exfoliation volume, specific surface area and pore volume up to 800 °C. Above this temperature these parameters tended to be stable.     

Enhancement of Attraction to Sex Pheromones of Spodoptera exigua by Volatile Compounds Produced by Host Plants

We measured the effects of exposure to volatile compounds produced by host plants on the rate of capture of male Spodoptera exigua using synthetic sex pheromones. Exposure to volatile compounds stimulated strong electroantennographic responses of male S. exigua. The behavioral responses of male moths to combinations of sex pheromone and volatile compounds were tested in wind tunnel experiments. When lures were baited with synthetic sex pheromone plus benzaldehyde, phenylacetaldehyde, (Z)-3-hexenyl acetate, or linalool, respectively, the landing rate of S. exigua males was increased by 101.4%, 79.6%, 60.6%, and 34.3%, respectively, compared to sex pheromone alone. In field tests, traps baited with either pheromone + (E)-2-hexenal, pheromone + phenylacetaldehyde, pheromone + (Z)-3-hexenyl acetate, or pheromone + (Z)-3-hexenol enhanced moth catches by 38.8%, 34.6%, 24.6%, and 20.8%, respectively compared to traps baited with pheromone alone. In a second field experiment, more S. exigua males were trapped with a combination of a synthetic sex pheromone blend and several individual host plant volatiles compared to synthetic sex pheromone alone. These results suggest that some host plant volatiles enhance the orientation response of S. exigua male moths to sex pheromone sources.     

Adsorption of trace polar methy-ethyl-ketone and non-polar benzene vapors on viscose rayon-based activated carbon fibers

The adsorption of polar methy-ethyl-ketone (MEK) and non-polar benzene vapors on viscose rayon-based activated carbon fiber (ACF) was investigated. The pore texture and surface composition of ACF were characterized by nitrogen adsorption at 77 K and X-ray photoelectron spectroscopy (XPS), respectively. Gas adsorption on the samples was measured by the gravimetric method and the Dubinin-Radushkevich (DR) equation was used to fit the experimental adsorption isotherms. The experimental results show that ACF with different pore texture and surface composition exhibited different adsorption and desorption behavior for polar and non-polar vapors. The effect of adsorbate polarity on the adsorption capacity at lower concentrations was more significant in the case of adsorbents with a smaller surface area. It was found that evacuation treatment greatly increased the adsorption rate.     

Multikernel semiparametric linear programming support vector regression

In many real life realms, many unknown systems own different data trends in different regions, i.e., some parts are steep variations while other parts are smooth variations. If we utilize the conventional kernel learning algorithm, viz. the single kernel linear programming support vector regression, to identify these systems, the identification results are usually not very good. Hence, we exploit the nonlinear mappings induced from the kernel functions as the admissible functions to construct a novel multikernel semiparametric predictor, called as MSLP-SVR, to improve the regression effectiveness. The experimental results on the synthetic and the real-world data sets corroborate the efficacy and validity of our proposed MSLP-SVR. Meantime, compared with other multikernel linear programming support vector algorithm, ours also takes advantages. In addition, although the MSLP-SVR is proposed in the regression domain, it can also be extended to classification problems.     

一种分布式的宽带网络测量系统

开发了一套跨平台、分布式的网络流量测量系统.可起到测量网络业务流、评估网络性能、规划网络设计等作用.该系统由控制中心、测量探针和数据存储服务器三个模块组成,实现了对网络流量的主动测量和被动测量.主要采用了IPFIX标准、FLEX web技术,实现了多任务调度、RIA应用,具有部署灵活、扩展性好、兼容性强、数据呈现清晰直...     

Crystal structure and dielectric properties of barium titanate–kaolinite composites

Barium Titanate–Kaolinite composites were prepared systematically by conventional solid-state method. The crystal structure and dielectric properties of samples were investigated by XRD and dielectric measurements, respectively. XRD results show that new phase BaAl₂Si₂O₈ was formed as kaolinite added into BaTiO₃. The 10 wt% kaolinite addition led to a considerable reduction in sintering temperature and a strong densification. The dielectric constant of BaTiO₃–Kaolinite composites tended to be stable with increasing of kaolinite content.     

Cross-fuzzy entropy: A new method to test pattern synchrony of bivariate time series

A new method, namely cross-fuzzy entropy (C-FuzzyEn) analysis, that can enable the measurement of the synchrony or similarity of patterns between two distinct signals, is presented in this study. With the inclusion of fuzzy sets, the similarity of vectors is fuzzily defined in C-FuzzyEn based on the exponential function and their shapes, rather than on the Heaviside function used in the conventional cross sample entropy (C-SampEn). Tests on simulated data sets and real EEG signals showed that C-FuzzyEn was superior to C-SampEn in several aspects, including giving the entropy definition in the case of small parameters, better relative consistency, and less dependence on record length. The proposed C-FuzzyEn was then applied for the analysis of simultaneously recorded electromyography (EMG) and mechanomyography (MMG) signals during sustained isometric contraction for monitoring local muscle fatigue. The results showed that the C-FuzzyEn of EMG-MMG signals decreased significantly during the development of muscle fatigue. The C-FuzzyEn showed a similar trend with the mean frequency (MNF) of EMG, the commonly used muscle fatigue indicator. However, C-FuzzyEn of EMG-MMG demonstrated a better robustness to the length of the analysis window in comparison with the MNF of EMG. The results suggested that the proposed C-FuzzyEn of EMG-MMG may potentially become a new reliable method for muscle fatigue assessment. It can also be applied to other bivariate signals extracted from complex systems with short data lengths in noisy backgrounds.     

荧光探针在食品中甲醛检测的最新应用进展

甲醛是一种高活性的小分子,具有环境毒性,对人体可以带来不可逆损伤。荧光探针法具有设备简单、操作简便、高灵敏度、高选择性等优点,在生物成像、生物体外检测等领域具有应用优势。在食品检测领域,尤其面对快速检测的需求日趋增长,荧光探针法,包括有机小分子荧光探针、纳米荧光探针、金属有机骨架探针等,为甲醛的痕量和快速检测提供了方法和平台,得到了不断关注和飞速发展。本文主要从反应机理和结构的角度,从有机小分子荧光探针、纳米荧光探针、金属有机骨架荧光探针3个方面介绍和讨论了近年来荧光探针法在食品中甲醛检测的应用进展,总结了不同类型荧光探针方法的特点和应用效果,为荧光探针法在食品快速检测领域的应用持续优化提供新的角度和思考。