城市垃圾渗滤液对地下水的污染及防治对策

文中主要阐述了城市垃圾渗滤液对地下水的污染情况，分析了垃圾渗液的主要成分，提出了环境监测方法，并针对垃圾渗滤液的特征以及我国目前的情况提出了其污染防治对策。     

青藏高原山区河流广义河相关系与多频率沿程河相关系

山区河流地貌由流域来水来沙和地质地貌等下垫面背景因素决定,基岩限制性河段与冲积河段相间分布,这些河流是否存在稳定的河相关系,是山区河流地貌演变研究亟待回答的重要问题.本研究以发源于青藏高原的六大水系共129个水文测验断面的实测流量和实测大断面数据为主要数据源,以青藏高原六大水系的沿程河相关系为研究对象,探讨了同一河段与...     

北方缺水地区水库汛限水位调整下的极限风险研究

为了挖掘水库调蓄能力,缓解北方地区出现的水资源危机,探讨水库提高汛限水位的可能性.以海河流域岳城水库为例,采用随机模拟法计算汛限水位调整下水库的极限风险.分别建立了线性白回归模型和典型解集模型模拟入库洪水过程,通过统计特性分析检验其模拟效果.研究表明,岳城水库的汛限水位至少可以从目前的132 m提高到135 m,此时超校核洪水位的极限风险远小于原设计标准,从而可以大大增加水库蓄水,提高水库的经济和社会效益.     

南水北调东线第一期工程江苏段低扬程泵站的机组选型研究

针对南水北调东线工程淮安四站、淮阴三站泵型比选,对低扬程泵站选用立式轴流泵和灯泡贯流泵进行了选型对比研究。提出了在目前条件下,立式轴流泵和灯泡贯流泵的选用范围。     

软贴面聚氨酯板材连续生产线简述

介绍了软贴面聚氨酯夹芯板材连续生产线设备的主要组成部分,对生产工艺、发泡液面的控制、理论密度的算法等做了详细介绍,并对在生产过程中,工艺参数对产品质量的影响做了深入分析,以助国内同行参考。     

硬质聚氨酯泡沫在城市集中供热管道上的应用

介绍了城市集中供热管道用硬质聚氨酯泡沫的笥能和组合原料的工艺参数，并对保温管道的3种生产工艺如手工浇注法，一步法连续生产及二步法生产工艺进行了介绍了比较，给出了直埋供热管道保温层厚度的理论计算公式。     

A novel and efficient procedure for the preparation of 4,4′-bis(chloromethyl)biphenyl by chloromethylation of biphenyl catalyzed by PEG1000-DAIL under homogeneous catalysis in aqueous media

As described in this article, 4,4′-bis(chloromethyl)biphenyl was obtained in 85% excellent yield by chloromethylation of biphenyl catalyzed by the recyclable temperature-dependant phase-separation system that comprised the dicationic acidic ionic liquid PEG₁₀₀₀-DAIL and methylcyclohexane under homogeneous catalysis in aqueous media. Compared to other synthetic methods, the novel method not only enhanced the yield, but also made the operating units easy workup. The mechanism of chloromethylation reaction and the process of catalysis in the thermoregulated ionic liquid bi-phase system were proposed.     

碳五分离先进工艺的开发研究

在结合常规碳五分离工艺缺点及碳五热二聚特性的基础上,开发了在异戊二烯(IP)与环戊二烯(CPD)分离之后进行热二聚的后热二聚碳五分离新工艺,IP与CPD分离的关键为IP分离塔与CPD回收塔的组合。结果表明:后热二聚碳五分离新工艺具有更高的产品收率、更好的产品质量等诸多优点。     

高效回收镍盐化工污泥制取硫酸镍技术工艺分析

对镍盐化工污泥中镍的浸出条件进行了分析和考察,对浸出液中沉铁和沉镍的p H值进行了系统的分析;采用水洗工艺对粗产品中氢氧化镍杂质的去除效果进行分析,最终采用加酸溶解和蒸发结晶的方式制取硫酸镍产物。     

The Harmonic Analysis of RMP Coil Power Supply in EAST TOKAMAK

In EAST TOKAMAK, resonant magnetic perturbation (RMP) coils, which are powered by RMP coil power supply (PS), are set to research edge localized mode, resistive wall mode and error field correction. In order to meet the requirements of fast response and output voltage ripple proposed by physical experimenters, the structure of multiple modules using cascaded carrier phase-shifted PWM H-bridges is adopted, which enhances the equal switch-frequency of the PS and improves the quality of output voltage. In the paper, theoretical calculation applying Fourier analysis is given to analyze its harmonics. Both simulation results on Matlab and test results of output voltage ripple show that the RMP coil PS can meet the requirements.