球团竖炉电除尘器电气控制技术的应用

着重介绍在球团竖炉电除尘器电气控制中的PLC应用,以及利用矩阵控制原理对PLC输出接口的扩展,详细介绍高、低压电气控制系统主要实现的功能和特点。     

Simultaneous nitrogen and phosphorus removal under low dissolved oxygen conditions

ＩｎｔｒｏｄｕｃｔｉｏｎＮｉｔｒｏｇｅｎ(Ｎ)ａｎｄｐｈｏｓｐｈｏｒｕｓ(Ｐ)ｉｎｍｕｎｉｃｉｐａｌｓｅｗａｇｅ ,ｗｈｉｃｈｍａｉｎｌｙｃｏｍｅｆｒｏｍｄｏｍｅｓｔｉｃｗａｓｔｅｗａｔｅｒａｎｄｓｏｍｅｉｎｄｕｓｔｒｉａｌｗａｓｔｅｗａｔｅｒ,ｗｉｌｌｃａｕｓｅｍａｎｙｈａｒｍｓａｎｄｒｅｓｔｒｉｃｔｔｈｅｎｏｒｍａｌｆｕｎｃｔｉｏｎｏｆｗａｔｅｒｅｎｖｉｒｏｎｍｅｎｔａｆｔｅｒｅｎｔｅｒｔｈｅｗａｔｅｒｂｏｄｙ .Ｔｈｅｐｒｏｂｌｅｍｏｆｎｉｔｒｏｇｅｎａｎｐｈｏｓｐｈｏｒｕｓｐｏｌｌｕｔｉｏｎｈａ…     

固相微萃取-液相色谱法测定水中二苯并噻吩

分别采用高效液相色谱与固相微萃取-高效液相色谱法建立了水中微量二苯并噻吩的分析方法,结果表明固相微萃取对二苯并噻吩具有非常明显的富集作用。实验得到固相微萃取技术最佳检测条件为:吸附时间20min,解析时间3min,色谱流动相甲醇/水=90/10,方法的变异系数为2.85%,加标回收率102.4%,检测限0.03μg/mL。     

固相萃取柱净化-液相色谱法测定大气中多环芳烃

建立以乙腈-水为流动相,高效液相色谱法测定大气颗粒物中16种优控多环芳烃化合物的方法。用玻璃纤维滤膜采集大气颗粒物,以二氯甲烷为溶剂,超声波提取样品,提取液过滤经溶剂转换后在C18硅胶柱上分离净化,洗脱液经氩气吹干浓缩后用乙腈定容,用乙腈-水作流动相进行高效液相色谱梯度洗脱分离,荧光检测器变波长程序检测。通过实验优化了16种多环芳烃化合物的分离和测定条件。16种PAH检测限为0.023~0.45μg／L,日内(n=5)和日间(n=5)相对标准偏差分别为小于1.20％和小于2.3％。该法具有快速、灵敏、准确、重现性好的优点,适合于大气中痕量多环芳烃的测定。     

SERES 2000COD自动分析仪几个技术问题

影响SERES2000COD自动监测仪数据质量因素很多,现就实践中影响较大的关键性的几个技术问题提出来讨论:包括仪器工作原理,工作曲线的确立,配制的化学试剂准确性对监测数据结果的影响及蠕动泵管的使用和更换条件.严格遵守SERES2000COD自动监测仪操作程序最大限度地发挥它所具有性能,提高数据的准确性.     

高陡边坡三维实体变形预测的研究

从高陡边坡变形预测的机理出发,综合考虑三维点变形之间的相互影响以及变形的时间效应。根据三维实体变形预测理论,利用Matlab编制变形预测程序,建立了高陡边坡三维实体变形模型。结合实际工程监测资料,回归出相应的参数,并进行后续变形预测。结果表明,预测值与实际监测值相接近,相对误差在4%以内,由此为滑坡预警和安全生产提供了依据。     

弯道明渠内危化品泄漏扩散的数值模拟

自由水面流动和危化品水体迁移扩散过程属有界性问题,利用两相流理论建立三维瞬态VOF动力学模型,在其基础上提出危化品水体迁移扩散的浓度压缩性微分方程,有限容积法离散方程,高分辨率Gamma离散格式适用于解决有界性问题,用Gamma格式离散VOF和危化品迁移扩散方程的对流项。对Chang实验的弯曲水槽的流动及危化品扩散进行数值模拟,模拟结果与实验结果较吻合。笔者建立的数学模型能准确地模拟水流三维特性突出的弯道水槽的流场和危化品水体迁移扩散过程。     

安全分级评价在工伤保险中的应用研究

为了完善工伤保险费率制度,增强其科学性与合理性,将模糊综合评价法应用于安全分级评价,并以此指导保险费率的制定。阐述了安全评价指标权重的确定方法,选用层次分析法构建安全评价指标权重模型,选用模糊评判法构建安全分级评价模型,得出了工程项目安全分级评价等级确定方法。以我国某山区高速公路第二施工现场为例,按照安全分级评价状况确定其工伤保险费率水平。最后分析了安全分级评价对保险费率制定的指导作用。     

原式电除尘器的特性及优势

介绍了原式电收尘器的特点，提出原式电收尘器较板式电收尘器不仅有很强的适应性，收尘效率高，而且适用场合广泛，制造工艺简单，运行成本低，有一定的推广使用价值。     

Effects of vegetation type on soil microbial community structure and catabolic diversity assessed by polyphasic methods in North China

Soil microbes play a major role in ecological processes and are closely associated with the aboveground plant community.In order to understand the effects of vegetation type on the characteristics of soil microbial communities,the soil microbial communities were assessed by plate counts,phospholipid fatty acid (PLFA) and Biolog microplate techniques in five plant communities,i.e.,soybean field (SF),artificial turf (AT),artificial shrub (AS),natural shrub (NS),and maize field (MF) in Jinan,Shandong Province,North China.The results showed that plant diversity had little discernible effect on microbial biomass but a positive impact on the evenness of utilized substrates in Biolog microplate.Legumes could significantly enhance the number of cultural microorganisms,microbial biomass,and community catabolic diversity.Except for SF dominated by legumes,the biomass of fungi and the catabolic diversity of microbial community were higher in less disturbed soil beneath NS than in frequently disturbed soils beneath the other vegetation types.These results confirmed that high number of plant species,legumes,and natural vegetation types tend to support soil microbial communities with higher function.The present study also found a significant correlation between the number of cultured bacteria and catabolic diversity of the bacterial community.Different research methods led to varied results in this study.The combination of several approaches is recommended for accurately describing the characteristics of microbial communities in many respects.