EPON在用户接入网的应用研究

本文简单介绍了中国电信集团采用EPON试验的情况,然后分析了目前新兴运营商在写字楼内的组网方案及存在的问题,有针对性地制定了EPON应用于写字楼的系统测试方案,测试结果表明EPON能够较好地满足写字楼客户需求.在此测试基础上,文章对EPON在写字楼和小区的应用模型和经济性进行了分析,并提出EPON近期的应用策略.     

热声系统跳频现象研究

进行了带声压放大器的驻波型热声驱动RC负载的实验研究,在实验中观察到频率跳变现象,根据驻波型热声系统的运行模式,对跳频现象出现的声阻范围、跳频现象随加热功率的变化关系以及跳频现象和声压放大器长度的关系进行了归纳和总结.     

降低转炉石灰消耗生产实践

对安钢第二炼钢厂转炉石灰消耗高的原因及对生产的影响进行了分析.通过铁水分兑、控制废钢搭配比例、改善渣料结构,优化工艺技术等措施,降低了转炉石灰消耗,实现了转炉造渣低成本运行.     

Susceptibility of Chinese Perch Brain (CPB) Cell and Mandarin Fish to Red-Spotted Grouper Nervous Necrosis Virus (RGNNV) Infection

Nervous necrosis virus (NNV) is the causative agent of viral encephalopathy and retinopathy (VER), a neurological disease responsible for high mortality of fish species worldwide. Taking advantage of our established Chinese perch brain (CPB) cell line derived from brain tissues of Mandarin fish (Siniperca chuatsi), the susceptibility of CPB cell to Red-Spotted Grouper nervous necrosis virus (RGNNV) was evaluated. The results showed that RGNNV replicated well in CPB cells, resulting in cellular apoptosis. Moreover, the susceptibility of Mandarin fish to RGNNV was also evaluated. Abnormal swimming was observed in RGNNV-infected Mandarin fish. In addition, the cellular vacuolation and viral particles were also observed in brain tissues of RGNNV-infected Mandarin fish by Hematoxylin-eosin staining or electronic microscopy. The established RGNNV susceptible brain cell line from freshwater fish will pave a new way for the study of the pathogenicity and replication of NNV in the future.     

甲醇氧化生产甲醛装置的工艺查定及分析(Ⅱ)

采用简捷法对两个吸收塔分别进行了计算 ,求出了理论级数、液气比、吸收率及尾气与吸收液的量和组成     

Investigation on infrared laser desorption of solid matrix using scanning electron microscope and fast photography

Infrared light from a pulsed optical parametric oscillator laser system was used to irradiate succinic acid (SA), a usual solid matrix used in matrix‐assisted laser desorption ionization, under vacuum. Ablated SA particles were trapped using a silica plate mounted 3.0 mm above and parallel to the sample surface. The morphology and particle size of ablated particles at different laser fluences were investigated using a scanning electron microscope (SEM). The dynamics of plume propagation for SA desorption process was studied with fast photography at atmospheric pressure. Plume expanding at 1.12 J/cm² laser fluence was recorded using a high‐speed CMOS camera and corresponding propagation distance was measured. The solid matrix desorption was driven by phase explosion according to plume model fitting, which was consistent with the results of SEM. Microsc. Res. Tech. 76:744–750, 2013. © 2013 Wiley Periodicals, Inc.     

土石混合体力学特性的颗粒离散元双轴试验模拟研究

土石混合体作为土体和碎石的混合体,其宏观力学特性与碎石特性密切相关。采用试验研究和数值模拟相结合的方法,对土石混合体的力学特性进行研究。基于FISH语言开发颗粒流的多边形碎石生成模块,通过室内试验校核颗粒流模型的细观参数,建立土石混合体双轴试验模型。提出以形状因子m作为衡量碎石磨圆度的指标,对碎石形状进行了量化。研究了碎石含量、强度、形状对土石混合体力学特性影响,探讨碎石对土体强度提高的细观原因,揭示土石混合料的强度指标随各主要影响因素的变化趋势。结果表明:碎石含量和强度越高,混合体的强度也越高,当含石量小于40%时,土石混合体的力学特性受土体主导;内摩擦角随着碎石含量增加而增大,而黏聚力却在减小;随着形状因子的增大,强度降低,黏聚力和内摩擦角均减小;土石混合体中应力分布不均,在碎石含量较高时,碎石形成骨架效应,承担了主要荷载。     

Synthesis and characterization of new fluorinated aromatic polyesters containing trifluoromethylphenoxy pendant groups

A series of novel fluorinated aromatic polyesters containing trifluoromethylphenoxy pendant groups was synthesized by interfacial polycondensation of 2‐(4‐trifluoromethylphenoxy)terephthalyl chloride with various bisphenols in dichloromethane. The polyesters obtained in good yields had weight‐average molecular weights of 70,600–29,800 g/mol, polydispersities of 1.81–2.08, and were all amorphous. All polyesters were easily soluble in organic solvents such as N,N‐dimethylformamide, tetrahydrofuran, o‐chlorophenol, pyridine, and dichloromethane. These fluorinated polyesters showed glass transition temperature of 133–210°C, and good thermal stability with almost no weight loss up to 378°C, the 10% weight loss temperature of 472–523°C as well as char yield of 32–63% at 600°C in nitrogen. These polyester films cast from chloroform solutions exhibited tensile strengths ranging from 102 to 126 MPa, elongation at break from 6.3% to 11.7%, and tensile moduli from 2.1 to 3.3 GPa. The resulting polyester films also displayed low dielectric constants between 2.18 and 2.49 (1 MHz), high transparency with an ultraviolet‐visible absorption cut‐off wavelengths in the 332–355 nm range, and excellent electric strengths (50.4–65.6 kV/mm) and volume resistivity (2.51–6.03 × 10¹⁶ Ω cm). © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

甲醇氧化生产甲醛装置的工艺查定及分析(Ⅰ)

对湖北省宜化股份有限公司 3 .5万t·a-1甲醛生产装置进行了物料查定 ,以工厂生产参数和分析结果为依据 ,计算了反应原料的氧醇比、水醇比、配料浓度 ,校核了反应器的选择性、转化率、收率 ,列出了物料衡算表     

提高硅烷试剂溶液稳定性的研究

硅烷试剂（SA）在金属防腐蚀和提高表面外涂层附着方面的应用是一崭新应用领域，本工作研究了该技术工业化的关键问题之一SA溶液的稳定性，针对提高稳定性的外加试剂进行了探讨；通过对溶液状态和电导率及其它一些相关参数与稳定时间关系的研究，得出可有效提高SA稳定性的添加剂，同时由相应的工艺试验，检验在这些影响因素下稳定性对硅烷膜的耐蚀性及再处理能力的影响。