ITMA 2007: 非织造产品生产技术(第一部分)

1 总体趋势 1.1 全套生产线的供应 纵观非织造行业的四大集团--Dilo,NSC,Trützschler和Oerlikon Neumag,显然其中每一家都能立刻提供用于加工短纤维非织造布的全套生产线.这四家集团现在都可为客户提供全套技术装备和支持的交钥匙工程服务.     

基于运动区域检测的运动目标跟踪算法*

针对传统基于模板匹配的运动目标跟踪算法存在着计算量大、模板漂移导致跟踪失败的问题,提出了一种基于运动区域检测的运动目标跟踪算法。该算法通过采用光流法对目标运动区域进行估计,计算出光流场区域的形心,确定待匹配图相匹配范围,再用模板框在已确定区域进行模板匹配跟踪。根据某开放实验室行人录像跟踪实验表明,本算法能够有效解决模板漂移问题,提高了跟踪实时性, 实现了视频对象目标的跟踪。     

资源约束的工期-费用-质量综合均衡优化

工程项目优化管理问题,在综合考虑项目更新资源约束、项目工期以及项目直接费用和间接费用的情况下,为了优化控制和调试,采用已挣得质量价值(EQV)实现对项目质量的量化分析,利用多属性效用函数对项目的工期、费用、质量三大目标进行综合均衡优化,并建立多模式优化模式.优化结果可以帮助承包商更好地控制项目进度,并根据不同关注点做出工期、费用和质量的综合平衡决策.应用改进遗传算法对模型进行优化求解,进行仿真验证了模型和方法的有效性,可为实际应用提供依据.     

面向应用层的流媒体性能测量指标

介绍了一种从流媒体接收者的角度对流媒体性能进行测量的方法,提出了相应的应用层评价指标。利用已有的商业化流媒体服务软件,通过改变网络环境在不同的条件下对指标进行测量,最后通过实验数据来验证这些指标的有效性。     

基于DM6446的移动视频监控系统的设计

针对实现移动视频监控系统面临实时性高、运算量大、可用带宽有限的挑战,提出一种新颖的以TI DaVinci技术为支持、TMS320DM6446 Soc为基础的解决方案;完成了相应软硬件设计,并通过GPRS网络实现了移动视频监控的功能.该方案具有实时性高、部署灵活、性能优越、体积小、成本低的特点,随着3G网络的开通和手机处理能力的增强,在移动视频监控领域有着广泛的应用前景.     

基于混沌理论的DCT域隐蔽通信算法

提出了一种新颖的基于DCT域的自适应信息隐蔽通信算法。首先对原始图像块的多特性参数进行模糊聚类,将图像块分成两类,一类适合隐藏信息,另一类不适合,其隶属度作为隐藏信息强度的自适应系数。将混沌系统产生的序列嵌入到通信载体上,利用混沌同步进行隐蔽信息的检测。仿真实验表明,该算法有较强的鲁棒性,同时能保证通信载体的隐藏信息质量,确保通信安全。     

微流道交流电水力泵的数值模拟及优化

描述了微通道内交流电水力泵(EHD)的工作原理,并用IntelliSuite(R)的Microfluidic模块对电水力泵进行数值模拟.并分析了影响电水力泵速度场分布的因素,包括流体电导率、驱动交流电频率和相位、电极维度以及电极间隙和数量等.通过数值模拟不同参数下的电水力泵,比较驱动压力大小,最后给出优化的设计结果,为给电水力泵设计参数的选择提供依据.本文对流道长度为5mm,宽0.4mm,厚度0.4mm的电水力泵做了优化设计的数值模拟,最后得到驱动电极宽度为0.01mm,电极间距为0.02mm.     

Analysis of bacterial community during the fermentation of pulque, a traditional Mexican alcoholic beverage, using a polyphasic approach

In this study, the characterization of the bacterial community present during the fermentation of pulque, a traditional Mexican alcoholic beverage from maguey (Agave), was determined for the first time by a polyphasic approach in which both culture and non-culture dependent methods were utilized. The work included the isolation of lactic acid bacteria (LAB), aerobic mesophiles, and 16S rDNA clone libraries from total DNA extracted from the maguey sap (aguamiel) used as substrate, after inoculation with a sample of previously produced pulque and followed by 6-h fermentation. Microbiological diversity results were correlated with fermentation process parameters such as sucrose, glucose, fructose and fermentation product concentrations. In addition, medium rheological behavior analysis and scanning electron microscopy in aguamiel and during pulque fermentation were also performed. Our results showed that both culture and non-culture dependent approaches allowed the detection of several new and previously reported species within the alpha-, gamma-Proteobacteria and Firmicutes. Bacteria diversity in aguamiel was composed by the heterofermentative Leuconostoc citreum, L. mesenteroides, L. kimchi, the gamma-Proteobacteria Erwinia rhapontici, Enterobacter spp. and Acinetobacter radioresistens. Inoculation with previously fermented pulque incorporated to the system microbiota, homofermentative lactobacilli related to Lactobacillus acidophilus, several alpha-Proteobacteria such as Zymomonas mobilis and Acetobacter malorum, other gamma-Proteobacteria and an important amount of yeasts, creating a starting metabolic diversity composed by homofermentative and heterofermentative LAB, acetic and ethanol producing microorganisms. At the end of the fermentation process, the bacterial diversity was mainly composed by the homofermentative Lactobacillus acidophilus, the heterofermentative L. mesenteroides, Lactococcus lactis subsp. lactis and the alpha-Proteobacteria A. malorum. After a 6-h fermentation, 83.27% of total sugars detected after inoculation were consumed (228.4 mM hexose equivalents) and a carbon (C) recovery of 66.18% in fermentation products was estimated. They were produced 284.4 mM C as ethanol, 71.5 mM C as acetic acid and 19 mM C as lactic acid, demonstrating the presence of homo- and heterofermentative, acetic and alcoholic metabolisms in the final product. It was also found, after hydrolysis, that the exopolysaccharide produced during the fermentation was mainly composed by fructose residues, probably inulin or levan.     

Singly ionized double-donor complex in vertically coupled quantum dots

ABSTRACT: The electronic states of a singly ionized on-axis double-donor complex (D2+) confined in two identical vertically coupled, axially symmetrical quantum dots in a threading magnetic field are calculated. The solutions of the Schrodinger equation are obtained by a variational separation of variables in the adiabatic limit. Numerical results are shown for bonding and antibonding lowest-lying artificial molecule states corresponding to different quantum dot morphologies, dimensions, separation between them, thicknesses of the wetting layers, and magnetic field strength.