面料再设计在牛仔服装中的运用

在服装创作的过程中,设计师通过全面理解材料性能,运用各种方法对现有服装面料或材质进行再度创造设计,以表达自己的设计理念,即为面料再设计。而牛仔服装正是通过风格迥异的面料再设计,不断表现出新的文化内涵,保持着旺盛的生命力。就其运用,将从其发展进程、主要特点、运用方法、表现方式4个方面进行阐述。     

棉竹浆绢丝混纺针织纱的研制

探讨棉竹浆绢丝细特混纺针织纱的生产工艺.针对绢丝原料黏性大、静电大、易缠绕、难成条、可纺性差等特点.采用绢纺原料开茧、切断开松等前处理.将绢丝与竹浆纤维棉包混棉再与精梳棉条混并,同时合理选择混纺比,配置各工序工艺参数,适当降低各机的速度,有效解决了棉竹浆绢丝细特混纺纱混纺的生产问题,使成纱强力和条干满足针织用细特纱的质量要求.     

气相色谱-质谱联用法测定涡轮机油中3种抗氧化剂

对抗氧化剂（抗氧剂）含量的检测是涡轮机油抗老化研究中的重要环节。选取甲醇对油样进行萃取,并采用气相色谱-质谱联用（GC-MS）法,建立了同时定量检测涡轮机油中2,6-二叔丁基对甲酚（T501）、N-苯基-α-萘胺（T531）和二辛基二苯胺（DODA）3种抗氧剂的方法。考察了该方法的准确度和精密度,并进行了实际样品的分析。研究结果表明,该方法检测上述3种抗氧剂的回收率在95.8%~101.2%之间,相对标准偏差不大于1.04%,且样品处理简便,分析速度快,适用于快速定量检测涡轮机油中抗氧剂。该方法的研制成功,也为涡轮机油中其他添加剂的定量检测提供了思路。     

夏热冬暖地区外墙节能保温施工技术要点

夏热冬暖地区的外墙节能保温施工方案有多种,本文重点介绍外墙自保温砌块,外墙外保温贴板和外墙内保温无机砂浆三种方案的施工技术要点,并提出一些合理化建议。     

基于ESL的多格式解码芯片前期设计优化

通过使用ARM ESL工具仿真基于Linux的多媒体系统,提出一种基于多核及计算加速的体系,这种架构可很快地映射到后期芯片设计中.给出了解码系统中IQIT、IP和DB等核心模块的软硬件分配、资源调度、存储分配方案.通过软硬件划分和优化,最终系统能够实时解码多格式多媒体文件.所提出的多媒体加速观点适合于嵌入式系统和PC多核应用,具有一定的普适性.     

Lord of the Links: A Framework for Discovering Missing Links in the Internet Topology

The topology of the Internet at the autonomous system (AS) level is not yet fully discovered despite significant research activity. The community still does not know how many links are missing, where these links are and finally, whether the missing links will change our conceptual model of the Internet topology. An accurate and complete model of the topology would be important for protocol design, performance evaluation and analyses. The goal of our work is to develop methodologies and tools to identify and validate such missing links between ASes. In this work, we develop several methods and identify a significant number of missing links, particularly of the peer-to-peer type. Interestingly, most of the missing AS links that we find exist as peer-to-peer links at the Internet exchange points (IXPs). First, in more detail, we provide a large-scale comprehensive synthesis of the available sources of information. We cross-validate and compare BGP routing tables, Internet routing registries, and traceroute data, while we extract significant new information from the less-studied Internet exchange points (IXPs). We identify 40% more edges and approximately 300% more peer-to-peer edges compared to commonly used data sets. All of these edges have been verified by either BGP tables or traceroute. Second, we identify properties of the new edges and quantify their effects on important topological properties. Given the new peer-to-peer edges, we find that for some ASes more than 50% of their paths stop going through their ISPs assuming policy-aware routing. A surprising observation is that the degree of an AS may be a poor indicator of which ASes it will peer with.     

基于DMX512协议的LED灯具控制系统

本文提出一种基于DMX512协议的高亮度全彩LED灯具控制系统。系统前级采用DMX512信号解码器作为DMX控制数据中继器,实现信号的频率调制和信号增强。LED灯具采用智能控制和AC-DCLED驱动一体化设计方案,电能利用效率高且控制灵活,并采用PWM调光方法可实现256级调光从而实现全彩变换。系统各个部件采用分布式连接,控制灵活而且维护方便,并设计单数据总线通信链路,降低了系统的布线成本。该系统为舞台灯光控制、室外装饰照明等应用场合提供了良好的解决方案。     

基于漏磁的管端自动探伤方法与装备

在分析钢管漏磁检测端部效应及其消除机理的基础上,提出了利用漏磁检测技术对钢管端部进行自动探伤的方法——端部移接法,即采用导磁构件来收集钢管端部泄漏磁场,并对端部磁路加以引导,借用另外的导磁构件与钢管端部对接后形成新的端部,使得原端部变为管体,从而减小钢管端部盲区。设计了磁路引导装置和探头,介绍了基于漏磁的管端自动探伤机的结构组成、原理和管端自动检测流程。该检测方法及装备可以将钢管端部的检测盲区控制在30mm以内。     

Optimization of conditions for preparation of ZSM-5@silicalite-1 core–shell catalysts via hydrothermal synthesis

Although the preparation of ZSM-5@silicalite-1 (ZS) core-shell catalysts has been reported in the literature, their selectivity to para-xylene (PX) in the toluene alkylation with methanol is difficult to control. Here we present the effects of water and ZSM-5 adding amounts in the synthesis solution, the hydrothermal synthesis time, and the Si/Al ratio of core ZSM-5 on the catalytic performance of ZS core-shell catalysts. The ZS core-shell catalysts were characterized by X-ray diffraction (XRD), N₂ adsorption, and NH₃ temperature-programmed desorption (NH₃-TPD) techniques. The highest PX selectivity of 95.5% was obtained for the ZS (Si/Al=140) catalyst prepared in the synthesis solution with a molar ratio of 0.2TPAOH:1TEOS:250H₂O at 175℃ and 10 r·min^-1 for only 2 h and the corresponding toluene conversion is as high as 22.8% for the alkylation of toluene with methanol.     

联合小波域和频域的图像去模糊算法

提出了一种在小波域和频域上联合恢复模糊图像的算法。首先在小波域上对模糊图像去噪,提出按照贝叶斯公式估计出小波系数的收缩因子,恢复出模糊图像的小波系数值。此后,按照正则化反卷积图像恢复算法,对去噪模糊图像进行恢复。该算法使得反卷积时的正则化算子选取为较小的值,从而恢复的图像既滤除了噪声,同时降低了边缘模糊等振铃效应。实验结果表明,选择拉普拉斯正则化算子,该算法恢复的图像质量优于频域正则化反卷积算法,此外在同等噪声水平下,不同图像的最优正则化参数处在较小的相同动态范围之内,避免了恢复算法中的反复经验试值寻求最优。