排序方式: 共有6条查询结果,搜索用时 15 毫秒
1
1.
2.
4.
从业已经超过10年,对于数据工作了解较多,接触的专长之人也较多,毕竟本人是数据类专业出身:面对新的的投身行业者和应届毕业生刚入行时,比较迷茫、浮躁,数据工作比较枯燥、单调、乏味、繁复、回报低,如何挺过入行适应期和行业工作低潮期,是很多人在思索的问题。 相似文献
5.
振弦式剖面沉降仪在软基堤坝施工监测中的应用 总被引:6,自引:0,他引:6
4651型振弦式剖面沉降仪是一种地基变形监测仪器,能直观、全面地量测地基观测剖面上各点的沉降.结合工程实例介绍其基本原理、试验方法、资料整理及其运用于堤坝施工监测的优越性. 相似文献
6.
珠江广州河段微表层与次表层水环境质量比较(英文) 总被引:1,自引:0,他引:1
The water quality in the surface microlayer(SML) and subsurface water(SSW) in the Guangzhou segment of Pearl River, a eutrophic urban river section in China, were analyzed. The spatial and temporal dynamics of nutrient concentrations, heavy metals and bacteria were examined from two sampling sites in monthly samples throughout 2010. The mean concentrations of total nitrogen, ammonia, nitrate and nitrite were higher than 7.0 mg/L, 3.1 mg/L, 1.1 mg/L and 0.3 mg/L, while total phosphorus and orthophosphate were 0.5 mg/L and 0.1 mg/L, respectively. These results indicated that the water quality was rich in minerals and eutrophic. The mean concentrations of Mn and Fe were higher than 0.013 mg/L; and Ni, Cr and Pb were higher than 0.001 mg/L. The mean concentrations were in the order of Mn Fe Ni Pb Cr. The concentrations of heavy metals in the Guangzhou segment were lower than the limit of the surface water quality standards in China and the World Health Organization(WHO), but higher than the median values in the world's freshwater. The density of bacteria ranged from 3.30×105 to 5.23×106 cells/mL, and the amount of cultivable heterotrophic bacteria ranged from 1.30×10 3 to 1.89×10 6 cfu/mL. Fecal coliform levels were beyond the V class of China water quality standard. The SML was enriched in nutrients, heavy metals and bacteria, with the maximum enrichment factor of 3.84 for nutrients, 8.00 for heavy metals, and 3.04 for bacteria, suggesting that the water quality of the SML of the Guangzhou segment of the Pearl River was more serious than in the SSW. 相似文献
1