基于自记忆模型的煤与瓦斯突出电磁辐射预测研究

利用实验测定的电磁辐射信号时间序列,用双向差分原理反导出一个非线性常微分方程;以其为微分动力核,运用动力系统数据机理自记忆模式构造自记忆方程并求出自记忆系数;利用该方程预测未来电磁辐射信号的变化,并与现场测定对比分析,用误差分析和距平分析法验证该模型正确性和预测准确率。实例表明:该自记忆模型预测与实测结果是一致的,相对误差均在6.7852%左右,距平符合率为90%;自记忆方法能有效应用于煤与瓦斯突出电磁辐射动态预测中;该模型与电磁辐射预测方法的有机结合能有效地提高预测准确性,从而为煤与瓦斯突出电磁辐射预测技术提供了一种新的研究途径。     

CO对定电位电解法测定SO2的影响及对策探讨

采用定电位电解法测定固定污染源废气中SO2,根据CO标准气体干扰SO2 测定的规律建立数学模型,并在实验室用CO标气对数学模型进行验证.用该数学模型对5家企业固定污染源废气中SO2 监测,将测定结果与碘量法的测定结果比对,绝对误差与相对误差在允许范围内.     

重庆城市电网工频电磁环境现状及安全性分析

在现场实测的基础上,分析研究了重庆城市电网中各种电压等级、各种类型变电站周边环境,多种形式架空线路下方区域以及地下电缆周围工频电磁环境的现状,对比国家现行标准限值,评价重庆城市电网的工频电磁环境的安全性,同时也指出随着架空线密度的增加,周围工频电场不但不增加,反而有降低的现象.目前擅自在输电线路下建房或增加房屋高度是危及电磁环境安全的主要问题,应加大监管力度,减少日后不必要的环保纠纷.     

定电位电解法测定烟气中SO_2的干扰问题及解决方法

烟气的含湿量、负压、干扰气体都会对SO2监测数据产生一定干扰,有时甚至会严重偏离实际值。基于定电位电解法测定烟气中SO2的原理,提出采样管设置加热冷凝功能;测试过程注意采样流量变化,当负压超过2.3kPa临时压力时需采取前置抽气泵消除压力;以及计算干扰气体临界浓度,进行软件修正等解决方法。     

环境电磁辐射测量比对

为考核辐射环境监测质量,浙江省辐射环境监测站组织了2010年全省辐射环境监测网络环境电磁辐射测量比对。采用稳健Z比分数法评价测量数据的一致性。结果表明,射频综合场强测量比对中,9台仪器测量结果满意,1台仪器测量结果离群。工频电磁场测量比对中,有9台仪器测量结果满意,2台仪器测量结果离群。88%的测量值为满意结果,12%为离群结果,测量比对有效地发现了测量仪器存在的问题,保证监测工作结果的准确性。     

废水总氰化物测定干扰的消除

为解决测定受有机物污染的城镇污水原水中氰化物含量过程中出现的总氰化物未检出,进出水总氰化物浓度倒大等问题,采取增加石油醚(90~120℃)萃取或银盐沉淀预处理的步骤,实现对干扰的消除,方法相对标准偏差在4.8%~26.5%之间,加标回收率在84%~90%之间。     

Direct observation of microcirculatory parameters in rat brain after local exposure to radio-frequency electromagnetic field

A cranial window method modified for our experiment enabled to observe the cerebral microcirculation including the blood-brain barrier permeability after a local expose to radio-frequency electromagnetic fields with a monopole antenna in rats. The present report reviews our recent publications that reported no noticeable changes in the cerebral microcirculatory parameters due to RF-EMF exposure.     

关于我国环境辐射防护标准的几点思考

随着科学技术的进步,环境辐射已成为本世纪的主要污染源之一。本文重点介绍了电离辐射和电磁辐射的防护标准体系,针对它们的特点及不足提出：我国今后制定新的环境辐射防护标准时,应统一环境电磁波容许辐射强度的国家标准,建立相关产品的电磁辐射强度国家标准,制定相关环境辐射防护标准,从而完善辐射防护标准体系,加强环境保护。     

Investigation of potential interferences on the measurement of dissolved reactive phosphate using zirconium oxide-based DGT technique

A diffusive gradients in thin films (DGT) technique based on hydrous zirconium oxide (Zr-oxide) has been recently developed for the measurement of dissolved reactive phosphate (DRP). In this study, the detailed performance of the DGT technique is reported. Spiking experiments revealed that several orthophosphate monoester compounds contributed to the Zr-oxide DGT measurements of DRP. However, such a phenomenon is unlikely to occur during field conditions due to the low concentration of organic P in typical natural waters. The presence of Cl- (up to 106 g/L), SO42- (up to 16 g/L), HCO3- (up to 817 g/L), and AsO2- and AsO 3 4 (both up to 1 mg As/L) in solutions had negligible effects on the measurement of DRP. The threshold concentrations of Cl-, SO42- and HCO3- have been increased from previous reports for the measurements of DRP using other adsorbent-based DGT techniques. The capacity for DGT measurements of DRP decreased with increasing solution pH (4.2-9.2). The lowest capacity (95 μg P/m2 at pH 9.2) was still greater than that of other DGT techniques that are usually used for the measurement of DRP (2-12 μg P/cm2 ). The Zr-oxide binding gel could be stored for up to 2 years without any aging effect. This period of validity was considerably longer than the ferrihydrite binding gel that is commonly used in present DGT devices (6 months). The field application revealed that the concentrations of DRP measured in three fresh water samples using the Zr-oxide DGT technique were in agreement with those of the traditional colorimetric method.     

电网规划环境影响评价实例分析与研究

电网规划环境影响评价属于战略环境评价的范畴。虽然中国实施了《中华人民共和国环境影响评价法》,标志着规划环境影响评价制度的正式建立,但中国的战略环境评价还处于起步阶段。为了在规划环境影响评价中更准确地对环境进行分析和评价,以山东“十一五”电网规划及2020年目标网架规划环评为例,探讨了电网规划环境影响评价的特点和要点,包括评价目标、评价范围,建立了指标体系以及内容框架等,并提出实际编制过程中遇到的困难。