聚苯硫醚纤维发展概况及应用前景

聚苯硫醚纤维是一种新型高性能合成纤维,由聚苯硫醚纤维级树脂采用常规的熔融纺丝方法,在高温下进行拉伸、卷曲和切断后制得,具有优异的热稳定性、耐化学腐蚀性、阻燃性等物化性能,在环保、电子、机械、汽车、纺织、航空航天等领域中得到了广泛应用。介绍了聚苯硫醚纤维的物化性能、制造工艺、技术进展、应用前景方面的一些情况,并对目前国内聚苯硫醚纤维产业的发展提出了一些建议。     

白茅花纤维的形态结构

白茅花纤维是一种细而中空的天然植物纤维,纤维呈圆柱形。长度约为10.0mm,截面近似圆形,细度约为12.3μm。白茅花纤维是一种尚未开发利用的天然植物纤维,但不适合于纺织服装生产,纤维的应用方向还值得研究。     

多酶分步水解法提高豌豆纤维纯度的研究

以豌豆粉丝废水分离渣为原料,对豌豆纤维的提取过程进行研究。通过耐高温α-淀粉酶、糖化酶、蛋白酶多酶分步水解的方法,去除豌豆渣中的淀粉和蛋白质。结果表明,耐高温α-淀粉酶添加量1.2%,反应温度为90℃,反应时间为60 min的条件下,豌豆膳食纤维的提取率最高;糖化酶加酶量为4.5%,反应温度为60℃,反应时间为110 min,pH为5.0的条件下,可达到良好的水解效果;蛋白酶的加酶量为1.0%,反应温度为55℃,反应时间为80 min,pH为8.5的条件下,酶解效果最佳。此时豌豆粉丝废水分离渣的膳食纤维含量可达到94%以上。     

分布式光纤传感器在油田水井注入剖面监测中的应用

目前油田常用的注入剖面监测方法存在施工周期长、井况适应性差、有污染等缺点。为了寻找新的注入剖面监测方法，采用分布式光纤温度传感系统（DTS）监测注水过程的井温变化情况，通过井温变化斜率定性分析各层注入量的大小。采用分布式声波传感系统（DAS）监测注水过程中井下的振动情况，根据振动能量分析，定位各配水器准确位置，并估算注入量大小。根据试验结果DTS和DAS系统可用于注入剖面的快速监测和估算，利于油田方更实时且准确的掌握注入剖面情况。     

纤维加筋淤泥固化土的黏-弹-塑性本构模型

为改善水泥基淤泥固化土的强度、变形和稳定性，拓宽固化土在实际工程中的应用场景，采用聚丙烯短纤维与水泥为原材料共同制备纤维加筋淤泥固化土样，通过一系列室内三轴不排水剪切试验研究不同纤维掺量和不同围压情况下的应力-应变响应特征。结果表明，纤维加筋显著改善了固化土的破坏模式，峰值强度和黏聚力呈现幂函数型增长，破坏应变略有增大，内摩擦角基本保持不变。根据实测数据和回归分析方法，引入Popovics模型并进行修正，建立一种可以反映固化土应变软化的黏-弹-塑本构模型，为合理设计纤维加筋淤泥固化土构筑物提供参考依据。     

Examining the prospects for Gigabit Broadband: Lessons learned from Google Fiber

This study examines possible lessons learned from the deployment of residential Gigabit networks based upon the novel approach taken by the Google Fiber project started in 2010. Even though Google Fiber paused any project expansion in 2016, calling into question the viability of their business model, the approach taken by Google Fiber elicits further research interest given four major innovations that this analysis identifies in its fiber-to-the-home business model. Based on a “top-down” financial model to estimate the costs of fiber deployment, this analysis shows that these four innovations pursued by Google Fiber, and now adopted on a widespread basis by other broadband providers, lower the costs of building residential Gigabit networks, and therefore can improve the prospects for new entry of service providers of residential broadband services. With technology advances pointing to further cost reductions in the cost of Gigabit networks, this analysis elevates the need for more detailed study of ongoing changes in the cost structure of local access networks to better anticipate future prospects for broadband competition.     

浅谈道路桥梁施工中钢纤维混凝土技术的应用分析

城市的快速发展结合科技的进步,使得我国基础建设的步伐不断加快。尤其是在一些大型的工程项目当中,使用了更多更加安全高效的施工工艺。本文以道路桥梁施工为例,详细的介绍了在该项目施工中使用的新型钢纤维混凝土材料,不仅改善了以往相关材料强度不足的弊端之外,还能在操作上简化起到节省造价的作用。并且在文中就钢纤维混凝土在道路桥梁施工中的应用进行详述,突出了这类新型材料的优势所在。     

Product design and tort law: Safety implications of increasing similarity in civil liability and regulatory standards

This article addresses the impact of changes in design defect tort law on safety in the European Union and the United States, and draws two conclusions bearing significant product safety implications. First, tort law’s approach to design defectiveness is developing more cohesion. Although important differences in jurisdictional approaches remain, the differences appear to be diminishing rather than growing. In both the United States and the European Union, courts are increasingly relying upon a risk/utility balancing test to determine whether to impose civil liability for allegedly defective product designs. Second, the direction in which tort law is evolving is bringing it closer to defectiveness tests typically employed by government regulatory agencies in Europe and the United States. Civil liability standards are increasingly similar to regulatory standards used in determining whether a product should be allowed on the market at all. This trend toward greater cohesion in tort standards, and tort law’s increasing similarity to regulatory standards, has both positive and negative implications for safety. On the whole, the trend is likely desirable – it should encourage efficient products that are closer to an optional blend of safety and utility.     

地理信息系统技术在光缆网络监测系统中的应用

本文作者针对系统地理信息系统模块实现中的三个关键问题,提出了图形、属性数据分开独立存储管理同时通过图元ID值建立关联的数据管理思想,并在此基础上提出两类数据双向查询的模型,最后讨论了故障点地理位置的映射标注算法。     

宽带IP接入技术

随着社会科技的发展,通信网络正发生着深刻的变革,宽带化成了电信发展的必经之路。本文主要概述了宽带接入技术中数字用户线路、混合光纤同轴网这两个比较重要的主流技术,分析各自的优缺点。并着重阐述了ADSL,HFC这两个重要的技术。