基于恒电量的远程腐蚀测量技术研究

从节省环境腐蚀实验的成本和时间的目的出发,结合数据积累 工作与实验室的应用基础研究的需求,提出搭载在现代移动通讯网 络平台上的恒电量腐蚀测量方法。与传统的自然环境腐蚀监测手段 相比,该系统费用经济,可行性强,可以在实验室内连续、动态地获取 环境现场的腐蚀信息,减轻了繁重的现场取样工作,能够更方便地研 究自然环境中金属的腐蚀与防护。     

Morphometric relationships and reproductive maturation of the mudskipper,Periophthalmus barbarus from subsistence catches in the mangrove swamps of IMO estuary,Nigeria

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如何测量生物膜内的氧浓度变化曲线

生物膜反应器用于废水处理厂处理城市污水，能高效地去除水中的营养物质。我国利用生物技术处理废水已经开展多年。但对生物膜的研究仍处于初级。本文介绍了新型的测氧微传感器（其测量尖部仅为２μｍ）在生物膜内进行测量的系统，设备有方法。     

超声波—文丘里渠流量测量系统的应用

明渠液体流量测量，离不开流量测量系统。随着对工业污染源监督监测力度的加强，在线监测要求的力度也在不断提高，促成对水质监测仪器及相关自动化控制所需各种测量技术、自动化仪器仪表技术的开发应用，发展与完善了许多应用技术。工业污水处理工程的管理、操作及控制，使用可靠、坚固、维护方便的仪表监控及数据采集系统已成为在线监测采用设备的首选要求，在各项污染监测指标中，流量的测量为最基本的测量参数，其重要性在总量控制要求不断加强的今天是不言而喻的。自由排水的文丘里渠，结构简单，它易于安装无磨损可以实现免维护，并且…     

Response of CH4 emission of paddy fields to land management practices at a microcosmic cultivation scale in China

The terrestrial ecosystem may be either a source or a sink of CH4 in rice paddies, depending, to a great extent, on the change of ecosystem types and land use patterns. CH4 emission fluxes from paddy fields under 4 cultivation patterns (conventional plain culture of rice(T1), no-tillage and ridge culture of rice(T2), no-tillage and ridge culture of rice and wheat (T3), and rice-wheat rotation(T4)) were measured with the closed chamber technique in 1996 and 1998 in Chongqing, China. The results showed that differences existed in CH4 emission from paddy fields under these land management practices. In 1996 and 1998, CH4 emission was 71.48% and 78.82% (T2), 65.93% and 57.18% (T3), and 61.53% and 34.22% (T4) of that in T1 during the rice growing season. During the non-rice growing season, CH4 emission from rice fields was 76.23% in T2 and 38.69% in T]. The accumulated annual CH, emission in T2, T3 and T4 in 1996 decreased by 33.53%, 63.30% and 65.?3%, respectively, as compared with that in TI. In 1998. the accumulated annual CH4 emission in T], T2, T3 and T4 was 116.96g/m^2, 68.44g/m^2, 19.70g/ms and 11.80g/m^2, respectively. Changes in soil physical and chemical properties, in thermal and moisture conditions in the soil and in rice plant growth induced by different land use patterns were the dominant causes for the difference in CH4 emission observed. The relative contribution of various influencing factors to CH, emission from paddy fields differed significantly under different land use patterns. However, the general trend was that chlorophyll content in rice leaves, air temperature and temperature at the 5 cm soil layer play a major role in CH4 emission from paddy fields and the effects of illumination, relative humidity and water layer depth in the paddy field and CH4 concentration in the crop canopy were relatively non-significant. Such conservative land use patterns as no-tillage and ridge culture of rice with or without rotation with wheat are thought to be beneficial to reducing CH4 emission from paddy fields and are, therefore, recommended as a significant solution to the problems of global(climatic) change.     

测量不确定度分析的实践与体会

结合广州市环境监测中心站实验室认可工作，讨论了测量不确定度分析的方法及应注意的问题，并以高氯酸－硫酸酸溶法测定土壤全磷的不确定度分析为例，对测量不确定度进行了具体的分析。     

城市区域环境噪声测量中的几个问题

城市区域环境噪声测量中存在时间段、测点位置、标准执行区类不明确等问题，建议由当地政府依据地的实际情况划分确切的测量时间段和适用的区域环境噪声标准类别。