Synthesis and characterization of high bio-based content unsaturated polyester resin for wood coating from itaconic acid: Effect of various reactive diluents as an alternative to styrene

The present work focuses on the ability of 2-hydroxyethyl methacrylate (HEMA), isobornyl methacrylate (IBOMA) and methyl methacrylate (MMA) as reactive diluents to replace styrene in unsaturated polyester resin based on itaconic acid, sebacic acid, 1,4-Butanediol, 1,6-Hexanediol and glycerol. The structural analysis confirmed the presence of itaconate linkages in the UPs. The synthesized resins were characterized by infrared spectroscopy and their physiochemical properties such as appearance, viscosity, acid value, %volatile content, curing characteristics like gel time, peak exotherm temperature and total cure time. Among all the resins formed; the resin based on 1,6-Hexanediol showed optimum molecular weight and viscosity needed for final application. The cured resins were investigated for their thermal stability by thermo-gravimetric analysis which revealed that all the diluted resins had good thermal stability. From the results it could be concluded that styrene-free bio-based unsaturated polyester resin can be synthesized having properties equivalent to the commercial styrene based resin.GRAPHICAL ABSTRACT     

Corrosion studies of polyaniline/coconut oil poly(esteramide urethane) coatings

Advancements in the area of conducting polymers have been towards their application as effective corrosion protective coatings to replace the use of heavy metals as additives in the coatings industries, which are now considered to be an environmental as well as health hazard. With the aim to utilize a sustainable resource based polymer for the development of an anti‐corrosive conducting coating material, coconut oil based conducting blend coatings of polyaniline and poly(esteramide urethane) were prepared by loading different ratios (2, 4 and 8 wt%) of polyaniline in poly(esteramide urethane). Then their physico‐chemical, thermal, morphological, conductivity and anti‐corrosive coating characteristics were investigated. The effect of a 2 year environmental aging process on the coated samples was analyzed by thermal methods as well as by corrosion studies. Results showed that the corrosion protective performance of the blend coatings was far superior than that of plane poly(esteramide urethane). These coatings showed enhanced corrosion protection in acid as well as alkaline environments upto 360 and 192 hr respectively. Conductivity of the blends was found to be in the range 2.5 × 10^?5–5.7 × 10^?4 S/cm^?1. An increase in the thermal stability of the blend coatings and a decrease in their conductivity was noticed in the aged samples which was attributed to the crosslinking effect. The corrosion protective performance of the coatings remained almost unaffected even after 2 years of aging. Copyright © 2005 John Wiley & Sons, Ltd.     

抗灾减灾综合应急指挥系统的建设应用分析

各种自然灾害突发事情引起的紧急情况对应急抗震救灾的响应速度、调度指挥等科学施救综合能力提出更高要求。为减少灾情所带来的财产损失和人身伤害,提高电力通信、资源分配等问题是当务之急,通过建立综合应急指挥系统,实现指挥调度和应急队伍调拨,各资源合理分配调拨与应急处理全过程运用,为应急指挥人员提供全方位应急决策信息,切实提高突发事件应急处置效率。     

一种基于域名解析机制的算力网络实现方案

新型数字化技术和业务的兴起,以及信息数据的爆炸式增长,对云—边—端多级算力资源提出了巨大的应用需求,算力基础设施泛在化成为一大发展趋势。算力网络将算力等资源与网络协同统一,结合用户需求提供最优的资源配置策略,同时提高多级算力资源的协同工作效率,成为网络技术发展的新方向。分析了当前算力网络的技术路线,提出了一种基于域名解析机制的算力网络实现方案。该方案引入域名解析机制,使用URL语言对多种算力资源进行统一标识,由集中式的算力资源管理平台对算力资源进行统一的分配调度。用户在收到分配的算力资源标识时,通过域名解析系统解析出相应资源的网络位置信息,并通过算力网关与资源池建立网络连接。此方案满足灵活扩展算力资源标识的需求,具有很好的实用性和通用性。     

训练数据中心物理资源整合技术研究

目前,部队军事训练具有数据来源多、数据量大和可靠性要求高等特点,对训练数据中心的物理资源使用效率提出了更高要求。针对训练数据中心目前物理资源使用效率有待提高的情况,对可用于整合物理资源的一些方法进行了介绍,在此基础上提出了基于云技术的服务器资源整合、存储设备资源整合及网络设备资源整合,为各业务系统提供统一的云平台、云数据库和开放式存储等服务,提高了训练数据中心的物理资源使用效率,降低了系统的运维成本。     

城镇化建设过程中的广播电视设施迁改分析

随着城镇化建设的不断推进,广播电视和通信等公共设施面临着与日俱增的迁改工作,在此过程中,有些拿到了迁改费用,有些没有拿到迁改费用,还有一些则原地不动造成乱象。在此过程中,政府、企业和公民三者之间的利益如何平衡,以依法行政角度并结合地方实际情况,从个案出发找寻解决的办法和策略。     

“微电子器件”课程混合式教学资源建设研究

本文在超新集团泛雅网络教学平台上引入“翻转课堂”教学模式、信息化考核机制等,让学生充分参与到教学中来;建设分层自主学习资源,直观形象地展现课程内容,培养学生自主学习能力、半导体器件应用及项目开发能力;搭建TCAD综合实验平台,一体化集成器件仿真分层学习资源,学生可以随时随地在校园内登录平台查阅资料完成课题任务,激发学生学习兴趣,提高教学效果。     

Essentiality of managing the resource information in the coordinated fog‐to‐cloud paradigm

Fog‐to‐cloud (F2C) computing is an emerging computational platform. By combing the cloud, fog, and IoT, it provides an excellent framework for managing and coordinating the resources in any smart computing domain. Efficient management of these kinds of diverse resources is one of the critical tasks in the F2C system. Also, it must be considered that different types of services are offered by any smart system. So, before managing these resources and enabling the various types of services, it is essential to have some comprehensive informational catalogue of resources and services. Hence, after identifying the resource and service‐task taxonomy, our main aim in this paper is finding out a solution for properly organizing this information over the F2C system. For that purpose, we are proposing a modified F2C framework where all the information is distributively stored near to the edge of the network. Finally, by presenting some experimental results, we evaluate and validate the performance of our proposing framework.     

高压直流系统与光伏混合供电的综合应用研究

本文首先介绍了中国移动通信机房楼及数据中心光伏资源应用情况,并针对目前光伏资源在通信机房及数据中心的应用方案进行了对比与分析,得出了一种新型的能够高效利用通信机房光伏资源的高压直流系统与光伏混合供电的方案,通过对目前通信机房楼及数据中心光伏资源的统计与分析,得出了光伏资源在中国移动大型数据中心有很大的应用价值的结论。另外通过对比目前几种不同的光伏并网及混合供电方案,得出了高压直流系统与光伏混合供电的最优方案。     

Polynonanolactone synthesized from vegetable oil: Evaluation of physical properties,biodegradation, and drug release behavior

A systematic investigation of the synthesis, physical properties, biodegradation, and drug release behavior of an aliphatic polynonanolactone from vegetable oil was performed. The chemical structure of the lactone monomers and polylactones were confirmed by NMR spectrometry and molecular weights were determined by gel permeation chromatography (GPC). The thermal behavior of the polymers was assessed by modulated differential scanning calorimetry (MDSC) and thermogravimetric analysis (TGA). The polynonanolactones are crystalline with melting enthalpies (ΔH_m) ranging from 90 to 135 J/g. The crystalline nature of the polylactides was further evaluated by X‐ray diffraction (XRD) and peaks corresponding to planes (110), (200), and (210) were detected. The hydrolytic and enzymatic degradation properties of the polynonanolactones were studied and the degradation rate is comparable to that of widely used polycaprolactone. The enzyme proteinase K was used for the degradation of polynonanolactones. The extent of degradation was evaluated by scanning electron microscopy (SEM). Drug incorporation and release traits due to hydrolytic degradation of the polymer film was carried out with 5‐fluorouracil (5‐FU) as a model drug. This new class of polynonanolactones obtained from vegetable oil was demonstrated to be a potentially competent candidate to replace petroleum‐based polycaprolactone especially for drug delivery applications where slow release of drugs is a requisite. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 6373–6387, 2009