基于PCI和FPGA的信号源设计

信号源是航天遥测试验的核心部件,它作为地面设备提供实验过程中所需的各种参数;本信号源采用模块化设计方法,将PCI技术和FPGA技术进行有机结合,对信号源进行了系统方案设计、系统硬件设计和系统软件设计等工作,通过控制FPGA内部ROM的读写、高精度D/A转换器AD9744的转换和多路选择开关ADG1208的选通,产生多路参数可控模拟信号输出;测试结果满足设计要求,已经成功应用于某地面测试设备的自检和检测中。     

聚氨酯弹性灌封料的研制

通过合成聚氨酯弹性灌封料,研究了异氰酸酯种类、多元醇、NCO/OH摩尔比以及阻燃剂的种类对灌封料性能的影响。结果表明,以蓖麻油为A组分多元醇,PAPI、液化MD I混合异氰酸酯为B组分,选用IPPP为阻燃剂,两组分NCO/OH摩尔比为0.9~1.2混合时,得到的产品固化后硬度适中,性能良好。     

利用测井资料进行裂缝的定量识别

本文在分析砂泥岩缝测井响应特点的基础上，提出了一套由微球，双侧向，声波，密度和倾角测提取裂缝测井异常信息的方法，然后根据松辽盆地古龙凹陷九口井６５个裂缝发育层段资料，分别利用综合判别函数和神经元网络方法分别建立了两个裂缝识别的数学模型，其判准率分别是８７％和９３％，表明神经元网络法识别裂效果较好，经处理实际资料说明上述裂缝定量识别方法是可行的。     

一种多传感器信息融合点目标识别方法（二）

提出了一种多传感器信息融合识别空间复杂弹道式目标及其伴随诱饵的识别模型。将人工神经网络和确定性理论结合起来，以神经网络的输出代替应用确定性理论所需的有关领域专家的知识和经验，并用确定性理论进行不同空域和时域的信息融合。仿真结果表明，经过融合后，大大改善了识别效果。     

薄木贴面工艺中起泡的预防与纠正

分析了薄木贴面工艺中，木皮起泡主要是由于表面不平、胶水固化程度和薄木含水率等原因所致。并对各个阶段出现起泡的具体情况进行分析，给出处理方法．     

碳四烃芳构化烷基化生产高辛烷值汽油组分联产蒸汽裂解料技术

研究纳米沸石分子筛SHY-DL催化剂上的芳构化反应性能,探索临氢条件、二烯烃含量、反应温度及空速等条件对芳构化反应的影响。在固定床反应器上以炼油厂碳四烃为原料,在反应温度360～450℃、压力2.0MPa、碳四烃液相进料体积空速0.9～1.2h-1的操作条件下,碳四烯烃转化率达99%,干气产率小于2.0%,C5+液相收率为43%～50%,液相产物的RON和MON值为98.8和87.9。在实验室蒸汽热裂解评价装置上,研究碳四烃芳构化副产LPG裂解制乙烯的性能。结果表明,在裂解温度910℃、水油质量比0.45的条件下,LPG裂解的乙烯收率为30.98%,丙烯收率为15.95%,属较好的裂解制乙烯原料。     

基于ANSYS8.0的蜂窝纸板力学性能研究

建立了蜂窝纸板的基本力学方程,利用ANSYS8.0对其静态特性进行了计算;得到了面受均布载荷时蜂窝纸板的应力分布图,分析了蜂窝纸芯的应力特点。结果表明：应力集中主要在蜂窝纸板的面纸和芯纸的胶接处,并出现应力峰值,这将对其缓冲性能产生不良的影响。此结论为蜂窝纸板的改进和优化设计提供了参考依据。     

Photoelectrocatalytic decontamination of oilfield produced wastewater containing refractory organic pollutants in the presence of high concentration of chloride ions

The feasibility study of the application of the photoelectrocatalytic decontamination of high saline produced water containing refractory organic pollutants was investigated in the slurry photoelectrocatalytic reactor with nanometer TiO2 particle prepared with sol-gel method using the acetic acid as hydrolytic catalyst. The efficiency of the photoelectrocatalytic decontamination of produced water was determined with both COD removal from the tested wastewater and the decrease of mutagenic activity evaluated by Ames tests. The experimental results showed that the photoelectrocatalysis is a quite efficient process for decontaminating the produced water, although there are high concentration of salt existed in oilfield wastewater. We found that the COD removal efficiencies by photoelectrocatalytic process are much higher than that of by photocatalytic or electrochemical oxidation individually in the photoelectrocatalytic reactor. The COD removal can be substantially improved by the added H2O2 and the generation of active chlorine from high concentration chlorides in the wastewater. The effects of various operating conditions, such as initial COD concentration, applied cell voltage, catalyst amount and initial pH value of solution, on the photoelectrocatalytic efficiencies, is also investigated in detail. The results showed that when the raw produced wastewater was diluted in a 1:1 (v/v) ratio, there is a highest COD removal efficiency. And the photoelectrocatalytic degradation of organic pollutants in saline water is much favored in acidic solution than that in neutral and/or alkaline solution.     

浸没式交换机液冷技术仿真与实验

交换机作为通讯传输技术的核心设备,内部芯片产生的热流密度越来越高,提高其散热效率是数据中心稳定运行的前提.本文对应用于交换机散热的新型浸没式液冷技术进行仿真与实验研究,通过高功率交换机的液冷散热仿真、浸没式液冷的散热效率实验对应用效果进行了分析和评估.结果表明:基于元件模型散热仿真分析的模型修正方法提高了温度预测的准确...     

Occurrence of nine nitrosamines and secondary amines in source water and drinking water: Potential of secondary amines as nitrosamine precursors

Due to their high carcinogenicity, the control of nitrosamines, a group of disinfection by-products (DBPs), is an important issue for drinking water supplies. In this study, a method using ultra-performance liquid chromatography-electrospray ionization tandem mass spectrometry was improved for simultaneously analyzing nine nitrosamines in source water and finished water samples of twelve drinking water treatment plants (DWTPs) in China. The method detection limits of the nine target analytes were 0.2-0.9 ng/L for the source water samples and 0.1-0.7 ng/L for the finished water samples. Of the nine nitrosamines, six (N-nitrosodimethylamine (NDMA), nitrosodiethylamine (NDEA), N-nitrosomorpholine (NMor), N-nitrosodi-n-butylamine (NDBA), N-nitrosomethylethylamine (NMEA), and N-nitrosodiphenylamine (NDPhA)) were detected. The total nitrosamine concentrations in source water and finished water samples were no detection-42.4 ng/L and no detection-26.3 ng/L, respectively, and NDMA (no detection-13.9 ng/L and no detection-20.5 ng/L, respectively) and NDEA (no detection-16.3 ng/L and no detection-14.0 ng/L, respectively) were the most abundant. Meanwhile, the occurrence of nine secondary amines corresponding to the nine nitrosamines was also investigated. All of them except for di-n-propylamine were detected in some source water and finished water samples, and dimethylamine (no detection-3.9 μg/L and no detection-4.0 μg/L, respectively) and diethylamine (no detection-2.4 μg/L and no detection-1.8 μg/L, respectively) were the most abundant ones. Controlled experiments involving chloramination of four secondary amines confirmed that dimethylamine, diethylamine, morpholine and di-n-butylamine in water can form the corresponding nitrosamines, with diethylamine and morpholine showing significantly higher yields than dimethylamine which has already been identified as a precursor of NDMA. This study proved that diethylamine, morpholine and di-n-butylamine detected in raw water would be one of the important the precursors of NDEA, NMOR and NDBA, respectively, in drinking water.