甲醛对Nessler法和次氯酸酚盐法测定养殖水体总氨氮的影响   总被引：1，自引：0，他引：1  

罗国芝  谭洪新  朱学宝  霍少勇 《中国海洋大学学报(自然科学版)》2002,32(3):397-402

水体中含一定浓度的甲醛 ,用 Nessler法测得的总氨氮 (TAN)浓度远远高于实际浓度 ,差异百分数最高达 4 5 0 .0 6 % ;用次氯酸酚盐法测得的总氨氮 (TAN)浓度则明显低于实际浓度 ,差异百分数最高可达 84 .77%。甲醛浓度范围为 10～ 4 0 mg/ L、TAN浓度为 1～ 10 mg/ L,通过双因素有重复观察值的交叉实验 ,得到如下矫正式 :(1)用 Nessler法测 TAN时 ,Y=4 .0 5 2 9- 0 .0 72 4 x1+ 0 .2 0 6 4x2 ,标准误差为 1.3381;(2 )用次氯酸酚盐法测 TAN时 ,Y=0 .1196 + 0 .0 345 x1+ 1.0 0 2 2 x2 ,标准误差为 0 .4 6 2 7。 Y为 TAN实际浓度 (mg/ L) ,x1为甲醛浓度 (mg/ L) ,x2 为测得的 TAN浓度(mg/ L )。比较含氨氮水体与不含氨氮水体中的甲醛浓度 ,方差分析结果表明 ,没有显著差异。  相似文献   

融冰季节北极破碎冰区热通量的初步研究   总被引：5，自引：1，他引：5  

史久新  赵进平  矫玉田 《海洋科学进展》2002,20(3):35-43

利用航空遥感数字影像的解析结果和实测气象，海洋和海冰资料，定量研究了夏季融冰期北极破碎冰区的热通量，计算了海洋对大气的热贡献，结果表明，在北极夏季海冰融化时，短波辐射远远大于感热和潜热通量，是表面热通量的决定因素，海洋对大气的热贡献主要由长波辐射决定，在观测期间，海洋对大气的热贡献为38～104Wm^-2，这部分热量的大小与海冰的密集度有关，当海冰密集度小于0.8时，海洋对大气的热贡献随海冰密度度的增大而减小，而当海冰密集度超过0.8以后，该热通量将随海冰密集度的增大而增大。  相似文献   

海冰板的环形屈曲的压缩破坏   总被引：2，自引：0，他引：2  

唐立强  陈会军等 《海洋工程》2001,19(4):29-33

在轴对称条件下，给出海冰板的环向屈曲面临载荷，从细观力学的观点分析了微裂纹开裂的条件，扩展方向并给出绕海洋平台柱腿冰的损伤区的尺度。所给出的临界半径是一个与冰材料力学特征，冰的微结构参数一海洋平台柱腿半径相关的特征参数。对现场所观察和测量的结构给出了解释和定量分析。  相似文献   

含沙量对草地坡面径流泥沙沉积和水力特性的影响   总被引：2，自引：0，他引：2       下载免费PDF全文

潘成忠  马岚  上官周平 《水科学进展》2008,19(6):857-862

通过室内模拟试验,在坡度为3°和9°、流量为20和60L/min条件下研究了不同浓度(0～350kg/m3)含沙水流流经草地的泥沙沉积过程及其水力学特性。结果表明,坡面泥沙沉积量随含沙量的增加而增大,3°时泥沙沉积率与含沙量呈正相关,而9°时沉积率与含沙量呈反势。坡度对泥沙沉积影响显著,而在相同坡度条件下,两种流量试验的泥沙沉积量无明显差异。相同坡面坡上部位流速小于坡下部位,且含沙量对坡面流速影响较小。在相同坡度和流量条件下,水流雷诺数随含沙量的增大而减小。3°时水流阻力系数和曼宁糙率均随含沙量的增加而增大,而9°时含沙量对阻力影响不明显,因此在土壤侵蚀较严重地区进行坡面水文过程演算时需考虑含沙量对缓坡糙率的影响。  相似文献   

The Role of Fracture Structure in Leachate Pollution at Landfills： A Case Study of a Landfill in Chongqing City     

LUO Yunju  LIU Dongyan  LI Xiulan  ZHU Zhengwei 《《地质学报》英文版》2008,82(5)

This paper studies a landfill where there are three faults running through.As serious pollution has occurred to the geological environment,the landfill is to be closed up and renovated.The paper aims to explore the role of fracture structure in leachate pollution at the landfill.The research was carried out in several stages.First,mathematical models of the pre-renovation landfill with three faults running through and the landfill after renovation were established.And then,the boundary conditions and parameters of the two mathematical models were determined.The groundwater level of the landfills was simulated in order to modify the two mathematical models.As a result,a feasible mathematical model was achieved.Based on this model,a comparison was made of the COD concentration variations in the inside leachate and outside leachate between the two landfills. Accordingly,the impacts of the fracture structure on the pollution of leachate at the landfills could be identified.The study results show that while faults contribute to the migration of leachate,they also serve as a confluence of leachate,thus further deteriorating the environment.The COD concentrations of the inside leachate and the outside leacbate of the pre-renovation landfill are respectively 800 mg/L and 220 mg/L higher than those of the post.renovation landfill.Therefore,measures must be taken to handle the leachate seepage in areas where there are faults as well as the neighboring areas so as to get the environmental pollution under control.  相似文献   

The Role of Fracture Structure in Leachate Pollution at Landfills: A Case Study of a Landfill in Chongqing City     

LUO Yunju  LIU Dongyan  LI Xiulan  ZHU Zhengwei 《《地质学报》英文版》2008,82(5):1020-1026

This paper studies a landfill where there are three faults running through. As serious pollution has occurred to the geological environment, the landfill is to be closed up and renovated. The paper aims to explore the role of fracture structure in leachate pollution at the landfill. The research was carried out in several stages. First, mathematical models of the pre-renovation landfill with three faults running through and the landfill after renovation were established. And then, the boundary conditions and parameters of the two mathematical models were determined. The groundwater level of the landfills was simulated in order to modify the two mathematical models. As a result, a feasible mathematical model was achieved. Based on this model, a comparison was made of the COD concentration variations in the inside leachate and outside leachate between the two landfills. Accordingly, the impacts of the fracture structure on the pollution of leachate at the landfills could be identified. The study results show that while faults contribute to the migration of ieachate, they also serve as a confluence of leachate, thus further deteriorating the environment. The COD concentrations of the inside leachate and the outside leachate of the pre-renovation landfill are respectively 800 mg/L and 220 mg/L higher than those of the post-renovation landfill. Therefore, measures must be taken to handle the ieachate seepage in areas where there are faults as well as the neighboring areas so as to get the environmental pollution under control.  相似文献   

基于非充分掺混模式的流域来水组成模型          下载免费PDF全文

王船海  朱琰  程文辉  向小华 《水科学进展》2008,19(1):94-98

针对如何减小数值求解对流输运方程耗散误差的问题,引进断面计算浓度的概念来计算河段平均浓度,提出了非充分掺混模式的有限控制体积法离散对流输运方程的新算法,据此构建了模拟流域内的水源组成以及不同水源在流域内的时空变化情况的流域来水组成模型。通过数值试验与具体实例验证,结果表明所提出的非充分掺混模式的新算法可有效地提高流域来水模型的计算精度。  相似文献   

对北秦岭太阳寺矿集区金矿成矿特征的初步认识   总被引：1，自引：0，他引：1       下载免费PDF全文

胡晓隆  赵利利 《甘肃地质》2008,17(1):41-46

甘肃省天水冯家场—两当太阳寺一带,是近年来资源评价和矿产勘查的重点,是秦岭-大别成矿省北秦岭成矿带中重要的矿化集中区。文章在分析区域构造背景的基础上,对该区成矿特征进行了初步总结,选择典型矿床进行了介绍,初次把该区命名为太阳寺矿集区,这将对该区矿产勘查工作部署,深入研究矿集区成矿规律具有参考意义。  相似文献   

云南公路滑坡稳定性分析中模糊信息分析法的应用   总被引：1，自引：0，他引：1  

李瑞娥  谢永利  王家鼎 《工程地质学报》2008,16(1):130-134

将模糊信息分析方法应用于公路滑坡稳定性分析。运用模糊信息分析中的模糊信息信息分配、信息集中等方法,在云南元磨高速公路滑坡的50组公路滑坡资料中选取了滑坡高度、坡度、组成物质的粘聚力、内摩擦角等重要影响因素,建立了其与滑坡稳定性之间的模糊关系,得到相应的滑坡稳定性分析数学模型。应用该模型对该区域其他滑坡进行验证,其效果良好,故该方法可较好的应用于实际。  相似文献   

利用矿物方解石进行水体除磷实验研究   总被引：4，自引：0，他引：4  

许虹  张静  高一鸣 《地学前缘》2008,15(4):138-141

为探索解决水体富营养化问题的新方法,利用矿物方解石对含磷溶液进行了除磷实验。实验结果表明,方解石晶芽可以促进磷的沉淀,降低溶液磷浓度;其降磷效果与溶液初始磷浓度有关,初始磷浓度为1.2mg/L,除磷率为12.68%,初始磷浓度为3mg/L,除磷率为69.94%,初始磷浓度为5mg/L,除磷率为88.48%;同样,实验温度升高,可使方解石降磷效果明显提高。经透射电子显微镜测试,除磷沉淀物没有明显的晶质体特征。  相似文献