智慧管网对标策略研究

本文在分析智慧管网建设关键技术的基础上,结合对标管理的一般方法,提出了智慧管网对标的基本策略。智慧管网对标涵盖管理和技术两方面内容,管理对标包括智慧系统的定义内涵、发展战略、建设目标、智慧化水平评价、企业组织架构改革、科研投入、投资收益以及标准体系等内容;技术对标包括物联网技术、数字孪生技术和知识库建设技术3类通用技术和智能化提升技术。对于管理对标和通用技术对标以一般性对标和行业对标为主,辅以竞争性对标,对于智能化提升技术对标,以竞争性对标为主,辅以一般性对标和行业对标。     

城市环境对全球变化的影响及响应研究综述

对居住环境的威胁、对水环境的威胁、对生态安全的威胁、对城市热岛效应的加剧四个方面。摄后指出了城市环境研究的应对策略为加强城市气象灾害预测、城市生态学研究、城市景观格局对热岛效应的影响研究。     

多功能电能表现场校准和故障分析

<正>多功能电能表已被广泛采用,但现场工作人员对它的现场校准和故障处理还采用对感应式电能表的方法。多功能电能表对现场校准的条件和现场校准的程序和方法以及故障分析方面提出了新的要求。笔者通过对多功能电能表功能特性的研究,对多功能电能表现场校准和故障分析方面积累了一些经验,本文从现场校准的条件和对交流电能表现场校准仪的要求出     

转动设备对中表架的挠度误差及其消除

转动设备的对中操作中,百分表对中法是最常用的对中手段,但存在表架挠度变化并对百分表的测量读数的精度将产生严重影响。特别在卧式设备轴系对中过程中,该系统误差对测量数据影响较大。本文就力图从表架挠度产生的原因,定量分析计算,及其工程测量方法等方面具体分析对工程中轴系对中的精度的影响,并提出百分表表架挠度误差的消除办法。     

网络安全技术研究

对近几年来的网络安全事件进行归纳,强调网络安全对计算机用户的影响。对常用的网络攻击与防御技术进行描述,对网络攻防的手段进行具体研究。     

企业能效对标管理标准化研究

目前我国的企业能效对标工作缺少标准支撑,导致其工作内容、对标流程、对标管理不规范,影响到企业能效对标工作的成效。本文从标准化的角度对企业能效对标管理标准化进行研究,分析了现有能效标准化的基础,探讨了能效对标的工作内容、实施步骤、技术要求、人员及管理等能效对标标准化的内容,并提出了企业在开展能效对标工作时需要注意的关键问题。     

环境和使用频率对硫化氢监测仪置信度的影响

依据对大量含硫油气井钻井过程中的硫化氢监测仪的检定实践，研究了当监测仪安装在钻井队的不同工作位置时，温度对监测仪置信度的影响、湿度对监测仪置信度的影响、以及使用频率对监测仪置信度的影响，建立了环境条件和使用频率对监测仪置信度的影响公式，把综合置信度概念引入对计量器具检定周期的评定。     

油田地面建设地理信息数据的处理分析

油田勘探开发过程中对油田数据的更新和准确性要求很高。因此,要采取相应的措施对这些数据进行及时、准确的处理,这对反映油田地面建设地理信息十分重要。这里我们对地理信息系统以及其对油田地面建设地理信息数据的处理分析进行简单的介绍。     

科学发展观打造人文检察理念

落实科学发展观,创建人文检察理念是我院学习实践科学发展观活动提出的新举措。 一、落实科学发展观,领情人文检察理念的深捌内涵 科学发展观注重科学,注重发展,注重创新。而人文检察理念的提出正是对科学发展观的深刻领悟和切实理解。检察理念是对检察工作的认识,是对检察规律的把握,其是蕴含于检察实务中的法律理性和对社会正义的价值追求。而人文检察理念的提出是对是对检察功能认识的再深化,是对检察规律的再丰富,是对履行检察职能的再充实,用人文的概念定义了检察职责的品格。     

氨气分析仪、报警器计量检定可行性分析

文章主要通过对氨气分析仪、报警器使用现状进行分析,提出了对该类仪器进行检定的必要性,并对检定的技术关键和可行性进行分析,对检定的主要内容进行归纳、主要检定指标进行解释.对实施计量检定后可能产生的社会效益进行预测分析.     

碳纳米管修饰酶传感器的评述

对酶传感器的作用机理和发展过程进行了介绍,综述了碳纳米管修饰酶传感器的最新研究进展.根据碳纳米管和基础电极结合方式的不同,把碳纳米管修饰酶传感器分为不可逆吸附型、糊类、阵列型、共价键合型几类,并对不同类型碳纳米管修饰酶传感器的制备方法、优缺点进行了评述,最后提出了碳纳米管修饰酶传感器的研究发展方向.     

New procedure for preparation of highly stable and well separated carbon nanotubes in an aqueous modified polyacrylonitrile

Carbon nanotubes (CNTs) due to their nonreactive surface can not effectively disperse in polymeric matrix. Efficient exploitation of CNTs properties to improve material performance is generally related to the degree of dispersion, saturation by the matrix and interfacial adhesion. In order to obtain a suitable dispersion, the CNTs usually need treatment before they can be utilized. In this work, an easy procedure for preparation a stable dispersion of well separated and individual CNTs in an aqueous polymeric solution by using of Gum Arabic (GA) and modified polymer has been described. The applied polymer was a modified water soluble acrylonitrile polymer. The modification was carried out through functionalizing polyacrylonitrile by 2‐aminoethanol. Individual dispersion of the CNTs in the aqueous GA solution after two month can be observed. By incorporating the modified polyacrylonitrile to the solution, the stability of the individual CNTs dispersion several times was increased in such a way that after six month, the CNTs were still kept at their individual positions. According to the suggested mechanism of dispersion, hydrogen bonds between GA/CNTs and the modified polyacrylonitrile chains can be formed that increasing the dispersion ability. The effects of salts and temperature on dispersion ability of GA were also studied.     

纳米碳管的表面改性方法研究进展

概括了目前几类常用的纳米碳管(CNTs)表面改性方法的研究进展,分析了各方法的特点、原理及存在的问题,简单地描述了改性后CNTs性质的变化。权衡各方法的利弊,提出了未来CNTs改性的研究方向,即应注重多学科的交叉应用,将各改性手段有机结合,提高修饰效果。同时指出,改性后的CNTs在环境中的迁移转化及产生的环境风险尚不清楚,在今后的研究中还需充分认识改性后CNTs的理化性质,这是对其进行客观风险评价的重要前提。     

化学处理对碳纳米管分散性能的影响

采用混酸氧化法对碳纳米管进行化学处理,制备了分散均匀的稳定的碳管悬浮液.FTIR研究表明:经化学处理后的碳管表面带上了羧基及羟基等基团. TEM显示处理后的碳管缠绕程度明显降低. ζ电位测试结果表明,处理后碳管表面酸根离子的离解增大了碳管表面的负电荷,增强了悬浮液的稳定性.通过测定有效粒径及沉降百分比进一步证实了处理后的碳管悬浮液具有更高的分散性及稳定性.     

碳纳米管改性泡沫镍/环氧树脂复合材料阻尼性能

采用一种新型简易的化学气相沉积法(CVD)直接在泡沫镍表面均匀地沉积生长碳纳米管(CNTs),然后通过真空导入模塑成型工艺(VIMP)将选定的环氧树脂体系填入表面负载CNTs的泡沫镍孔洞,制备CNTs-泡沫镍/环氧树脂复合材料。利用FE-SEM、TEM和Raman对在不同反应温度条件下泡沫镍表面形貌和所生成CNTs的形貌、结构及石墨化程度进行了表征,并采用动态机械分析仪(DMA)研究了CNTs对泡沫镍/环氧树脂复合材料阻尼性能的影响。结果表明:当反应温度为680℃时,在泡沫镍表面可获得较好的CNTs沉积效果,且所生成的CNTs石墨化程度和纯度较高且直径尺寸较为均匀。同时所制备的CNTs-泡沫镍/环氧树脂复合材料比泡沫镍/环氧树脂复合材料,最大损耗因子tanδ_(max)从0.69提高到0.78,玻璃化转变温度Tg从60℃偏移到68℃,有效阻尼温域ΔT从39℃扩宽到44℃,整体阻尼性能提高了18.9%。     

Interaction of two nearby CNTs/nanovoids embedded in a metal matrix using modified nonlocal elasticity

Interaction of Carbon Nanotubes (CNTs) and nanovoids embedded in a metal matrix is studied comparatively. For this purpose, two nearby CNTs/nanovoids are modeled as two similar cylindrical inclusions/holes in an infinite matrix. The nonlocal stresses around the CNTs/nanovoids are obtained by applying the integral constitutive equation of the nonlocal elasticity to the stresses from the complex stress potential method. Also, in order to bring different nonlocality effects of dissimilar media into account, the influence function of the nonlocal elasticity is modified. Effects of the CNTs/nanovoids size and distance as well as far-field loading ratio on the stress state in the matrix are investigated. The CNTs strengthening effect on the matrix is shown through lower stresses at the CNTs and matrix interface in comparison to the applied stress. Furthermore, it is indicated that the modified nonlocal analysis brings out the interaction of CNTs/nanovoids at smaller distances in comparison with those the classical analysis used to predict. In other words, higher volume fraction of the CNTs/nanovoids can be incorporated in the metal matrices without devastating effects of their interactions.     

Interaction of two nearby CNTs/nanovoids embedded in a metal matrix using modified nonlocal elasticity

Interaction of Carbon Nanotubes (CNTs) and nanovoids embedded in a metal matrix is studied comparatively. For this purpose, two nearby CNTs/nanovoids are modeled as two similar cylindrical inclusions/holes in an infinite matrix. The nonlocal stresses around the CNTs/nanovoids are obtained by applying the integral constitutive equation of the nonlocal elasticity to the stresses from the complex stress potential method. Also, in order to bring different nonlocality effects of dissimilar media into account, the influence function of the nonlocal elasticity is modified. Effects of the CNTs/nanovoids size and distance as well as far-field loading ratio on the stress state in the matrix are investigated. The CNTs strengthening effect on the matrix is shown through lower stresses at the CNTs and matrix interface in comparison to the applied stress. Furthermore, it is indicated that the modified nonlocal analysis brings out the interaction of CNTs/nanovoids at smaller distances in comparison with those the classical analysis used to predict. In other words, higher volume fraction of the CNTs/nanovoids can be incorporated in the metal matrices without devastating effects of their interactions.     

Sidewall functionalization of carbon nanotubes through electrophilic substitution

We report a general strategy for functionalizing the sidewalls of carbon nanotubes (CNTs), which is based on electrophilic substitution reactions on phenylated CNTs. By using this strategy, four new functionalized CNTs were prepared, including diphenyl ketone, benzenesulfonyl chloride, benzyl chloride and thiophenol modified CNTs. The benzenesulfonyl chloride and benzyl chloride functinalized CNTs could serve as novel initiators for surface-initiated atom transfer radical polymerization. The thiophenol modified CNTs were used in immobilizing Pd nanoparticles on the CNT surface, and the CNT/Pd hybrid produced exhibits good catalytic efficiency for the electrochemical oxidation of methanol.     

Microwave Absorption and Mechanical Properties of CNTs/ PU Composites with Honeycomb Structure

Applied Composite Materials - Honeycomb structural composites were fabricated by impregnating aramid paper frame with modified whisker carbon nanotubes (CNTs) and polyurethane resin (PU). CNTs were...     

动态注射成型聚丙烯制品的热氧老化性能EI

利用电磁动态注射机注射成型聚丙烯试样制品,并用热老化试验箱人工加速其试样的老化降解。对比分析了稳态注射和动态注射成型的聚丙烯试样制品热氧老化期间力学性能的变化规律,用红外光谱(FT-IR)分析了聚丙烯试样制品老化前后羰基含量的变化情况。研究结果表明,采用动态注射成型技术,不但可以提高聚丙烯制品的力学性能,而且还能有效提高制品的抗热氧老化性能。制品在热氧老化过程中,其力学性能保持率高于稳态注射成型的聚丙烯制品。采用振频为8 Hz、振幅为0.10 mm的动态注射成型的聚丙烯试样制品的抗热氧老化性能最好。