Water Networks
Mostrando 13-24 de 153 artigos, teses e dissertações.
-
13. REFERENCE EVAPOTRANSPIRATION FORECASTING BY ARTIFICIAL NEURAL NETWORKS
ABSTRACT: Evapotranspiration (ET) is the main component of water balance in agricultural systems and the most active variable of the hydrological cycle. In the literature, few studies have used the forecast the day before via Artificial Neural Networks (ANNs) for the northern region of São Paulo state, Brazil. Therefore, this aimed to predict the reference
Eng. Agríc.. Publicado em: 2017-12
-
14. Seasonal variation in fish trophic networks in two clear-water streams in the Central Llanos region, Venezuela
RESUMO Redes alimentares não são entidades estáticas; interações entre consumidores e recursos variam no tempo e no espaço, o que complica as representações das estruturas de redes alimentares. Nós estimamos a estrutura da assembléia de peixes e dieta em dois riachos de água clara na região venezuelana dos Llanos (Charcote e Charcotico) e constru
Neotrop. ichthyol.. Publicado em: 03/07/2017
-
15. Water distribution network segmentation based on group multi-criteria decision approach
Abstract A correct Network Segmentation (NS) is necessary to perform proper maintenance activities in water distribution networks (WDN). For this, usually, isolation valves are allocating near the ends of pipes, blocking the flow of water. However, the allocation of valves increases costs substantially for the water supply companies. Additionally, other crit
Prod.. Publicado em: 10/04/2017
-
16. A new cement slurry modified with chitosan/alginate interpenetrating networks and hydroxyapatite - structural characteristics after long-term contact with hyper-saline produced water from oil well operations
ABSTRACT Oil is an important source of energy, mainly in developing countries. Important research has been conducted to find cementing procedures that guarantee safe and cost-effective oil exploration below pre-salt layers. This work aimed to make a new cement paste with cement, seawater, silica, biopolymers (chitosan and sodium alginate) and hydroxyapatite
Matéria (Rio J.). Publicado em: 10/04/2017
-
17. Spatial Interpolation of Rainfall Erosivity Using Artificial Neural Networks for Southern Brazil Conditions
ABSTRACT Water erosion is the process of disaggregation and transport of sediments, and rainfall erosivity is a numerical value that expresses the erosive capacity of rain. The scarcity of information on rainfall erosivity makes it difficult or impossible to use to estimate losses occasioned by the erosive process. The objective of this study was to develop
Rev. Bras. Ciênc. Solo. Publicado em: 19/09/2016
-
18. Decision model to control water losses in distribution networks
Abstract The losses in the urban water supply networks have become a growing concern. There are several alternatives for the quantification, detection and monitoring of water losses. However, in general, water companies have budgetary and other constraints that hinder implementation. Therefore, this paper presents a model to aid the selection of a subset of
Prod.. Publicado em: 25/07/2016
-
19. REDUÇÃO DE VARIÁVEIS DE ENTRADA DE REDES NEURAIS ARTIFICIAIS A PARTIR DE DADOS DE ANÁLISE DE COMPONENTES PRINCIPAIS NA MODELAGEM DE OXIGÊNIO DISSOLVIDO
The objective of this work is to demonstrate the efficient utilization of the Principal Components Analysis (PCA) as a method to pre-process the original multivariate data, that is rewrite in a new matrix with principal components sorted by it's accumulated variance. The Artificial Neural Network (ANN) with backpropagation algorithm is trained, using this pr
Quím. Nova. Publicado em: 2016-04
-
20. Fluoride concentrations in the water of Maringá, Brazil, considering the benefit/risk balance of caries and fluorosis
Current Brazilian law regarding water fluoridation classification is dichotomous with respect to the risks of and benefits for oral diseases, and fluoride (F) concentrations less than 0.6 or above 0.8 mg F/L are considered outside the normal limits. Thus, the law does not consider that both caries and fluorosis are dependent on the dosage and duration of flu
Braz. oral res.. Publicado em: 10/03/2015
-
21. Synthesis of Poly(Dimethylsiloxane) Networks Functionalized with Imidazole or Benzimidazole for Copper(II) Removal from Water
Functionalized elastomeric networks were obtained via a polycondensation reaction between poly(dimethylsiloxane) (PDMS) containing Si(CH3)2OH as end groups and an imidazole- or benzimidazole-modified alkoxysilane. The structure of the polymeric materials was characterized via attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and
J. Braz. Chem. Soc.. Publicado em: 2015-02
-
22. Preparation and Structural Characterization of Hydroxylethyl Methacrylate Grafted Natural Rubber Latex
The graft copolymer with semi-interpenetrating polymer networks (semi-IPNs) from 2-hydroxyethyl methacrylate (HEMA) and natural rubber (NR) latex was prepared using cumene hydroperoxide and tetraethylene pentamine redox initiator system. The changes of grafting ratios and grafting efficiency with the reaction time and temperature, the concentration of crossl
Polímeros. Publicado em: 10/06/2014
-
23. Modelo computacional de otimização para dimensionamento de redes de distribuição de água abastecidas por múltiplos bombeamentos. / Computational model of optimization for sizing of water distribution networks supplied by multiple pumping.
Os altos custos envolvidos nos sistemas de distribuição de água, particularmente no que diz respeito aos projetos e operação dos mesmos, refletem a importância de se estudar meios de minimizar os desperdícios de água e energia elétrica, a fim de elevar a eficiência desses sistemas. Na tentativa de minimizar e evitar tais desperdícios, este trabalh
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/09/2012
-
24. Modelagem computacional visando a reabilitação de redes hidráulicas / COMPUTER MODELING IN ORDER TO REHABILITATION OF HYDRAULIC NETWORK
Este trabalho de tese tem por objetivo desenvolver um modelo computacional robusto com vistas à calibração multivariada de modelos hidráulicos de sistemas de distribuição de água, possibilitando a identificação de possíveis irregularidades como: vazamentos, obstruções nas tubulações, válvulas inoperantes ou estranguladas e incompatibilidades n
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/06/2012