高碳铬铁降碳探讨

介绍了在12 5MVA电炉上进行高碳铬铁降碳的试验情况 ,分析了影响FeCr67C6 0合金含碳量的因素 ,从理论和实践两方面阐述了降碳措施     

纳滤回收染料废水中染料的实验研究

以含盐染料废水为研究对象,应用商业化的卷式膜组件,研究了纳滤膜对染料和盐的截留特性．实验结果表明,纳滤膜对染料的截留率高达99％以上．当染料分子量高于膜截留分子量时,染料初始浓度和染料品种对染料截留率的影响甚小,盐浓度对染料截留也无明显影响,但对NaCl截留率影响显著．随料液中NaCl浓度的增加,盐截留率快速下降,当盐浓度达到3．5％时,NaCl的截留率低于25％．纳滤膜对染料的高截留率和对NaCl的低截留率,使得应用纳滤技术从含盐染料废水中回收染料具有较好的经济性和可行性．     

华测为什么能上市

华测上市让从事检测认证的业内人士尤为关注的是,一个成立不到7年的民营检测机构,却能跨越数量众多的民营和国有检测认证公司成为第一个成功上市的公司,不由得让人们心中多个"为什么"。华测为什么能上市?它给我们带来哪些经验?在此,笔者有几点看法,与同行商榷。一、市场导向与技术导向2003年,对于中国检测认证行业具有特殊的意义的一年,因为这是我国加入WTO后检测认证业全面放开的第一年。根据公开资料显示,华测实际上在2003年由目前公     

柴达木盆地油泉子储油构造分析

通过对野外露头、地震反射剖面和钻井资料的综合分析,查明柴达木盆地油泉子储油构造为共轭膝褶带夹持的不对称半箱状背斜,具有北北东倾的平直转折端,北翼为一宽超过800m的大型膝褶带,高角度倾向南南西,带内岩层产状直立。带内岩层的旋转指示南侧沿膝褶带向北逆向剪切。南翼发育四条规模较小的膝褶带,向南逆冲剪切,导致该翼呈阶梯状产出,总体南南西倾,倾角约20°。沿南北两翼膝褶带边界仅见小型高角逆断层,膝褶带内裂隙发育,主要为顺层张裂隙,其次为与层理近垂直的张裂隙(主要出现在坚硬的钙质粉砂岩中),偶尔见有小型低角逆冲断层。这些断裂普遍被纤维状石膏充填,并见少量油迹,表明这些断裂为高流体压力下的产物。鉴于膝褶带及相关背斜高点为裂隙发育带,具有油气运移和聚集的双重功能,在缺乏足够理想的岩性储集层的情况下,为寻找裂隙型油气藏提供了新途径。     

Improve on/off ratio of organic heterojunction transistors by adopting single-sandwich configuration

Organic heterojunction transistors (OHJTs) based on 5,5′″-bis(naphtha-2-yl)-2,2′:5″,2′″-quaterthiophene (NaT₄)/copper-hexadecafluoro-phthalocyanine (F₁₆CuPc) heterojunction were fabricated in single-sandwich and sandwich configurations, respectively. All the devices operated in depletion-accumulation (normally-on) mode. High field-effect mobility of 0.35 cm²/Vs was obtained for all devices, which was higher than that, 0.20 cm²/Vs of the devices with NaT₄ as active layer. The on/off ratio of 1 × 10⁵ was obtained for OHJTs with single-sandwich configuration, which is three orders of magnitude higher than that of OHJTs with sandwich configuration. Compared with OHJTs with sandwich configuration, the higher on/off ratio was mainly determined by the lower off state current in OHJTs with single-sandwich configuration. In OHJTs with single-sandwich configuration, the well-type shield effect of the source and drain electrodes caused a very narrow empty region in F₁₆CuPc film, which is responsible for the lower off state current.     

Mechanical and moisture-dependent swelling properties of compressed Japanese cedar

In this research, five groups of compressed wood specimens were investigated, four made from compressed Japanese cedar (Cryptomeria japonica D. Don) with compression ratios (CR) of 33%, 50%, 67% and 70%, and one without compressing for control purpose. The measurements of moisture-dependent swelling of the specimens were carried out in the R, T and L directions, with typical strain values of 10%, 1.5% and 0.1% respectively corresponding to the CR = 67%. Mechanical property tests of the compressed wood were also undertaken. Material properties obtained cover radial and tangential swelling strain rates, shear moduli in LR, LT and RT planes, Young’s moduli in the L, R, T directions and Poisson ratios in all planes. The Young’s moduli along the longitudinal and radial directions have been increased by over 300% in relation to the CR of 70%.     

一种多频感应测井仪激励电路设计

多频感应测井是一种新兴的技术,有诸多传统测井技术无法比拟的优点。激励电路的设计是仪器重要的一环,它决定了仪器的感应强度。本文通过分析激励频率、效率和放大类型的关系,解析E类放大器的工作原理,从最优化激励效果的角度,提出了多频感测井激励电路的设计思路,并通过仿真软件进行参数仿真设计。仿真实验结果验证了所选择激励电路的正确性及先进性,为后续测井仪器激励电路的设计提供了依据。     

钢筋混凝土阴极保护极化曲线实时测试仪器设计

阴极保护是应用于钢筋混凝土腐蚀防护的一种有效技术,测试其阴极极化曲线对于防腐系统参数设计具有重要的指导意义。本文设计了一种极化曲线测试仪器,该仪器通过嵌入式系统控制强制电流阴极保护系统的激励电流,采集阴极保护系统由此产生的电位变化,测试的数据由嵌入式系统暂存并通过无线通信接口传输到监控中心计算机,监控计算机存储并分析保护行的极化曲线。试验结果表明该仪器能自动、实时地测试阴极保护系统的极化曲线,为检测被保护结构物的保护状态提供数据支持。     

传真机电源电路分析及故障检修方法

电源电路是传真机的重要组成部分,由于电网电压的不稳定性及电源电路工作的连续性.使该电路成为传真机中故障率较高的电路。本文分析了传真机电源电路的组成及工作原理,并介绍了该电路中常见故障的检修方法。