换热式转化炉下猪尾管裂纹原因分析及改造建议

对已使用3 a、材料为Incoloy 800H合金的505C制氢装置换热式转化炉下猪尾管裂纹进行了分析,通过无损探伤、现场测量、材料元素分析、工艺运行状况、结构应力等方面的分析讨论,论证了裂纹产生的原因是由操作温度、结构应力等多种因素造成的,并对改进该装置提出了建议。     

The corrosion behavior of TiN coated and uncoated incoloy 800 alloy

Incoloy alloy 800 is used in a variety of applications in industry as well as in domestic appliances for sheeting on electric heating elements. The composition of the alloy enables it to resist deterioration in many corrosive environments. However, resistance of the alloy to corrosion in aqueous media needs to be further examined. The present study examines the corrosion properties of Incoloy 800 alloy of both coated and uncoated workpieces obtained in a 0.1N H₂SO₄ + 0.05N NaCl solution. TiN coating is achieved using a physical vapor deposition (PVD) technique while corrosion tests are carried out using electrochemical polarization methods. Moreover, in order to examine the influence of hydrogen diffusion, reduction of hydrogen at the Incoloy 800 surface is carried out in a solution of 0.1N HNO₃ + 1 g/L thiourea. Tensile tests are conducted on the workpieces to determine the influence of hydrogen embrittlement on the resulting mechanical properties of the substrate. To examine the pit formation and stress induced microcracking, scanning electron microscope (SEM) analysis is carried out. The results show that the corrosion resistance of the alloy improves after TiN coating. In addition, no specific pattern or differentiation on the pit geometry is observed. The pitting rate and its size reduce considerably for TiN coated workpieces.     

模拟光耦SLC800在转台系统中的应用

在大功率转台控制系统中．存在着较大的电压干扰和电磁兼容问题。在转台的控制精度和驱动功率不断提高的情况下．本文使用模拟光耦隔离器件SLC800重新设计了转台中的某部分模拟电路．将功率放大电路和控制电路隔开，来增强系统的抗干扰能力和运行的可靠性。实验结果的分析和转台的运行表明：应用模拟光耦进行隔离，有效地消除了转台控制中的干扰和电磁兼容。     

Localized corrosion studies on materials proposed for a safety-grade sodium-to- air decay-heat removal system for fast breeder reactors

The present investigation was carried out to assess the localized corrosion resistance of materials proposed for the construction of the safety-grade sodium-to-air decay-heat removal system for fast breeder reactors. The materials, such as Alloy 800,9Cr-lMo steel, and type 316LN stainless steel, in different microstructural conditions were assessed for pitting and stress-corrosion cracking resistances in a chloride medium. The results indicated that 9Cr-lMo steel in the normalized and tempered condition can be considered for the above application from the standpoint of corrosion resistance.     

DSJ800可伸缩带式输送机技术改造

根据淄矿集团许厂煤矿和岱庄煤矿的生产准备要求,对DSJ800可伸缩带式输送机的机头部、驱动部、游动小车和机尾等进行技术改造。     

HP800破碎机常见故障原因分析及对策

HP800破碎机是鞍矿齐大山选矿厂破碎系统中的主体设备,具有破碎比大、运转效率高及产品粒度均匀等优点,它能否稳定运行对选厂的生产起着至关重要的作用.因此,对该破碎机常见故障产生的原因进行分析与处理,确保设备稳定运行.     

LTE 800M部署策略与VoLTE业务发展关系

随着LTE(长期演进)网络从重点覆盖转向全面覆盖,运营商逐渐启动了低频段资源重耕用于LTE广覆盖,并开展VoLTE(LTE语音)业务部署。文章总结LTE 800M的技术特点,分析LTE 800M的部署策略以及LTE 800M对VoLTE业务的承载能力,梳理LTE 800M部署与VoLTE业务发展之间的关系,认为二者能相互促进,加速LTE网络全面发展和CDMA退网。     

一类二次多项式混沌及其随机数生成器设计

构造了一类与Tent 映射拓扑共轭的二次多项式混沌映射,该二次多项式混沌映射具有三个系统参数,并给出了该类混沌映射的概率密度函数。根据对应的概率密度函数,设计了一个反正弦函数,通过反正弦函数变换,使二次多项式混沌映射生成的随机数在区间（－0.5,0.5）上服从均匀分布,利用区间划分的方法设计了一个能生成{0,2m－1}的伪随机数发生器。理论分析和实验结果表明该随机数发生器生成的随机序列具有较好的初值敏感性、自/互相关特性,并通过了NIST SP800-22 随机数检测。     

纺丝工艺对T800碳纤维及其复合材料性能的影响

采用扫描电子显微镜(SEM)、原子力显微镜(AFM)、X射线光电子能谱仪(XPS)和表面接触角测量仪分别对湿法纺丝(T800HB)与干喷湿纺(T800SC)两种纺丝工艺制备的T800碳纤维表面状态进行表征和分析,采用万能材料试验机对二者的复丝、NOL环及单向板的力学性能进行对比研究。结果表明:湿法纺丝的T800HB碳纤维具有更粗糙的表面,而干喷湿纺T800SC碳纤维具有更高的表面活性,“化学活性”和“机械啮合”的共同作用使得两种碳纤维复合材料具有相近的层间剪切强度。但当复合材料发生破坏时,T800HB碳纤维与树脂间“机械啮合”的主导作用更显著,纤维/树脂结合更紧密,使得其复合材料的断裂呈脆性破坏模式,而T800SC碳纤维与树脂结合则稍弱,呈一定程度的韧性破坏模式。T800SC碳纤维比T800HB碳纤维具有更高的复丝拉伸强度,因而相应地,T800SC碳纤维复合材料NOL环和单向板均有更高的拉伸强度。因此,综合两种不同纺丝工艺碳纤维及其复合材料的力学性能和破坏形貌,相比于T800HB,T800SC碳纤维更适合作为缠绕成型复合材料的增强材料。     

LTE800MHz网络部署策略分析

在社会快速发展的今天,LTE800MHz网络部署策略的分析十分重要.其不仅能够让网络的覆盖面积得到整体性的提升,还能让网络部署的体系结构得到相应的优化.本文主要针对LTE800MHz网络部署的方法进行分析,并提出了相应的优化措施.