scholarly journals A Risk Analysis Model for the Maintenance and Rehabilitation of Pipes in a Water Distribution System: A Statistical Approach

2015 ◽  
Author(s):  
Hernan Cortez
2013 ◽  
Vol 441 ◽  
pp. 1093-1096
Author(s):  
Wen Zeng ◽  
Yong Ting Pan ◽  
Hong Mei Huang

Scientific analysis of the leakage of the water distribution system in city is very helpful to water supply network’s maintenance and renovation, and hence reduces negative social effect and economic loss. A leakage risk nalysis model for water distribution system was established based on fuzzy analytical hierarchy process (FAHP) and BP neural network (BPNN). This model introduces FAHP to reasonably ensure initial state of BP neural network, and uses weighted superposition to mend learning sample set of BP neural network. The water distribution system of a city in Zhejiang province P. R. China was selected to test the proposed risk analysis model, which verifise its feasibility and effectivity.


2005 ◽  
Vol 52 (8) ◽  
pp. 177-180 ◽  
Author(s):  
R. Santos ◽  
F. Oliveira ◽  
J. Fernandes ◽  
S. Gonçalves ◽  
F. Macieira ◽  
...  

Mycobacteria have emerged as a major cause of opportunistic infections. Until the present, only a few studies have characterized mycobacteria present in the water distribution system of urban areas. In this study, we characterize these microorganisms in the Lisbon water distribution system. Our results indicate a high rate of positivities (90.5%) with mainly saprophytic mycobacteria. Around 63% of these results belong to strains of Mycobacterium gordonae indicating a generalized proliferation of this species in the Lisbon water distribution system. A total of 21.05% of the isolates are from M. kansasii, M. intracellulare and M. chelonae.


1979 ◽  
Vol 13 (11) ◽  
pp. 1420-1420
Author(s):  
David J. Schwartz ◽  
Jitendra Saxena ◽  
Frederick C. Kopfler

1983 ◽  
Vol 75 (11) ◽  
pp. 564-568 ◽  
Author(s):  
LeVerne D. Hudson ◽  
James W. Hankins ◽  
Michael Battaglia

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