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Numerical Analysis and Its Applications: Second InternationalConference, NAA 2000 Rousse, Bulgaria, June 11–15, 2000 Revised Papers

This e-book constitutes the completely refereed post-proceedings of the second one overseas convention on Numerical research and Its purposes, NAA 2000, held in Rousse, Bulgaria in June 2000. The ninety revised papers awarded have been conscientiously chosen for inclusion within the publication in the course of the rounds of inspection and reviewing.

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To 5 Oct. In contrast, the levels of total and fecal coliforms decreased by one order of magnitude from 2 Oct. to 3 Oct. Figure 2-6 shows the relationship between total and fecal coliforms. Black spots indicate the presence of enteroviruses (a) and noroviruses (b) in the corresponding samples. A good correlation between total and fecal coliforms was observed, while both enteroviruses and noroviruses were detected even when levels of the two bacterial indicators were low. If enteric viruses occurred proportionally with bacterial counts, one would expect to see no black spots in areas of the graph where coliform counts are very low.

These phenomena – caused by an excessive inflow of nutrients that has been accelerated by urban populations, resulting in the increase of concentrations called eutrophication (Caperon et al. 1971) – have been causing many problems for fisheries and recreation areas in urban coastal zones. However, these events are also influenced by weather conditions, ocean currents, household and industrial wastes, nutrients coming from agricultural lands, sewage treatment plants, acid rain and other such phenomena (Ærtebjerg et al.

2006) 22 F. Nakajima et al. However, the link between the source and the bioaccessibility is still not clear and further investigation is necessary. Although the PAH bioaccessibility in road dust was low (Nakajima et al. 2006), the alteration in the environment has yet to be evaluated. 1 Introduction Separate sewer systems have been installed in many cities in Japan since 1970 to improve water pollution control in public water bodies. 5%), including large cities such as Tokyo or Osaka. Combined sewer systems receive rainwater as well as municipal wastewater during wet weather conditions.

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