随机过程“各态历经”理论应用于环境噪声监测优化布点

本文尝试应用随机过程“各态历经”理论，在大、中、小多个样本中研究城市环境噪声监测的时—空相关性，找出“定点测量法”与“网格测量法”的内在联系，探讨以“定点测量法”取代“网格测量法”进行城市区域环境噪声普查的可行性，从而实现环境噪声监测优化布点及为实现城市环境噪声自动监测布点提供技术依据     

广州市流溪河水库监测布点优化研究

运用方差分析及模糊聚类分析,对流溪河水库监测布点进行优化研究,结果表明：水库水质良好,各监测点间及垂向采样点间均无显著性差异;4个库区监测点可分为3类,其余监测点可分为4类。综合考虑确定流溪河水库监测布点方案,应设置对照、控制、出水3类断面,共7个监测点,分别为玉溪河、吕田河、汇水区、库区3个和大坝监测点,每年6月进行垂向分层采样,其余月份进行表层采样。     

西安市交通噪声监测点位优化

结合西安市具体的交通状况及路网构成,提出了通过3次优化,由繁至简,逐步筛选出典型的能代表西安市整体交通噪声平均水平的监测点位方法。     

PM2.5手工监测技术要点探讨

以重量法为原理的手工监测法是国内外监测环境空气PM2.5质量浓度的标准方法,在空气质量监测中具有重要应用。该文以2012年跨4个季度近150 d的PM2.5手工监测实际操作经验为基础,重点探讨了手工监测法各环节的监测技术要点,如手工监测采样器的操作技术、滤膜种类的选择及前处理要求、滤膜更换技术、滤膜平衡和称重条件、质量保证和质量控制技术等,以期为推广PM2.5手工监测法提供技术参考。     

稀土改进型Fenton氧化法处理高浓度活性染料废水

研究了稀土双氧水处理高浓度活性染料废水的最佳反应条件。探讨了双氧水加入量、稀土量、温度及反应时间对COD去除率的影响。     

Analyzing the tradeoffs among ecological and fishing effects on an example fish community: A multispecies (fisheries) production model

Species interactions such as predation or competition can have notable implications for fish population dynamics. Stock status and associated biological reference points can be misrepresented if these interactions are not considered. Here we present a multispecies, biomass production model (MS-PROD) developed by incorporating modifications to the Schaefer production model. The modifications explicitly emphasize a functional group approach, highlighting the effects of species interactions that include competition between species within a group, competition between groups, and predation. The mathematical formulation also includes constraints on carrying capacity for both the entire system and for individual groups. We applied the model as initialized to the Northeast U.S. Large Marine Ecosystem finfish community. We then executed simulations designed to explore the behavior of the model with respect to fishery exploitation and ecological interactions. Collectively, the results demonstrated the utility, and the need, for incorporating ecological effects into fisheries models.     

Implementation of airborne trace element monitoring with devitalised transplants of Hypnum cupressiforme Hedw.: assessment of temporal trends and element contribution by vehicular traffic in Naples city

A biomonitoring of airborne trace elements was performed in 2006 in Naples urban area through the exposure of devitalised Hypnum cupressiforme for 10 weeks at 4 m height. In one street, the moss was exposed at different heights to assess vertical gradients of element concentrations. Results were compared with those of a 1999 biosurvey. Correlations among Al, Fe and Ti suggested a soil particles contribution to element uptake. Cu, Mo and Fe were related with traffic flows. Long-range transport contributed to Cd, Cu and Mo accumulation in moss at higher heights. As in 1999, the airborne element load was higher in coastal sites, more affected by marine aerosols and traffic. In all sites, contents of Cd, Fe, Pb, Ni and V in moss were remarkably lower than in 1999, indicating a positive effect of actions set up in recent years to reduce the traffic and to improve the city air quality.     

实验室质量负责人必须重视的宣贯第一课

文中分析了实验室质量负责人讲好管理体系宣贯第一课的重要性,介绍了这一课的内容应该如何设置,为读者参与实验室的日常管理和质量负责人的宣贯工作提供参考。     

Trigger points and systemic effect for EMF therapy

The use of magnetic fields (MFs), in general, and electromagnetic fields (EMFs), in specific, as therapeutic modalities is becoming very common. In the USA, EMFs are mostly used in orthopedics, followed by pain relief and the wound-healing arena. Even though a substantial literature exists worldwide, we are still lacking the accepted comprehensive mechanism(s) of action. In general, it is thought that the best therapeutic effects are achieved when the stimulation is applied directly to the target area. Since the beginning of this century, however, more and more evidence has been collected indicating that effects of the MF stimulation may also be observed at site(s) different from the site of application of the signal. A primary purpose of this paper is to propose a link between the systemic and direct effects. The functional units known as trigger points are discussed as possible “doors” allowing the stimulation to be delivered to the target tissue/organ. A second purpose is to suggest some possible modes of action.