195 research outputs found

    Multi-objective optimization of rural water supply system

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    [EN] Lack of water in water supply systems forces people to take risk behaviors to health, which is very common in rural water supply systems (WSS-rural). The objective of this research was to develop and apply a multi-objective optimization model for WSS-rural in the county of Cuiabá, Mato Grosso State, Brazil. The research methodology consisted of: (1) formulation of the optimization model (OM); (2) application of OM; (3) analysis of results; and (4) computer implementation of OM. To solve the problem, it was proposed and used a load loss generator part. It was found that the problem of water shortage can be solved by small operational and structural modifications. It was developed a multi-objective OM for WSS-rural based on Multi-objective Nonlinear Integer Programming technique (MONLIP) implemented in OpenOffice.org environment. The developed OM was applied to a real case with satisfactory results.[PT] A falta de água em sistemas de abastecimento de água obriga a população a assumir comportamentos de risco à saúde, o que é muito frequente em sistemas de abastecimento de água rural (SAA-rural). O objetivo desta pesquisa foi desenvolver e aplicar um modelo de otimização multiobjetivo para SAA-rural no município de Cuiabá, Estado de Mato Grosso, Brasil. A metodologia de pesquisa constou de: (1) formulação do modelo de otimização (MO); (2) aplicação do MO; (3) análise de resultados; e (4) implementação computacional do MO. Para resolução do problema, foi proposta e utilizada uma peça geradora de perda de carga. Constatou-se que o problema de falta de água pode ser resolvido por meio de pequenas modificações operacionais e estruturais. Foi desenvolvido um MO multiobjetivo para SAA-rural, baseado na técnica de Programação Não Linear Inteira Multiobjetivo (PNLIMO) implementado em ambiente OpenOffice.org. O MO foi aplicado a um caso real, apresentando resultados satisfatórios.Silva, W.; Vieira, L.; Rosa, D.; Campos, M.; Santos, A.; Souza, M. (2016). Otimização multiobjetivo de sistema de abastecimento de água rural. Ingeniería del Agua. 20(4):217-232. doi:10.4995/ia.2016.5915.SWORD217232204Azevedo, R.P. (2004). Caracterização de sistema de abastecimento de água em comunidades rurais de várzea na Amazônia. Anais do 2° Seminário Internacional de Engenharia de Saúde Pública, Dezembro 1-3, Goiânia, Brasil, 705-710.Beinat, E. (1997). Value Functions for Environmental Managment. Kluwer Academic Publishers, Dordrecht, NED. doi:10.1007/978-94-015-8885-0Cuiabá. (2014). Prefeitura de Cuiabá: Bairros. Disponível em: http://www.cuiaba.mt.gov.br/imprime.php?cid=7884&sid=377. Acesso em: 05 de nov. 2014.Farmani, R., Walters, G., Savic, D. (2006). Evolutionary multi-objective optimization of the design and operation of water distribution network: total cost vs. reliability vs. water quality. Journal of Hydroinformatics, 8(3), 165-179. doi:10.2166/hydro.2006.019Ferreira, E.P., Ferreira, Y.P., Venturini, A.F., Moura, A.S., Rolim Neto, F.C. (2015). Saneamento rural - o desafio para o abastecimento de água em comunidades quilombolas no Estado de Alagoas. Anais do 28° Congresso Brasileiro de Engenharia Sanitária e Ambiental, Outubro 4-8, Rio de Janeiro, Brasil, 1-5.Francato, A.L., Barbosa, P.S.F. (2004). Soluções de compromisso na tomada de decisão sobre a operação diária de sistemas urbanos de abastecimento de água. Revista Brasileira de Recursos Hídricos, 9(2), 39-50. doi:10.21168/rbrh.v9n2.p39-50Fu, G., Butler, D., Khu, S.T. (2008). Multiple objectives optimal control of integrated urban wastewater systems. Environmental Modelling & Software, 23(2), 225-234. doi:10.1016/j.envsoft.2007.06.003Goicoechea, A., Hansen, D.R., Duckstein, L. (1982). Multiobjective Decision Analysis with Engineering and Business Applications. John Wiley & Sons, New York, USA.Jowitt, P.W., Germanopoulos, G. (1992). Optimal pump scheduling in water-supply networks. Journal of Water Resources Planning and Management, 118(4), 406-422. doi:10.1061/(ASCE)0733-9496(1992)118:4(406)Larock, B.E., Jeppson, R.W., Watters, G.Z. (2000). Hydraulics of Pipeline Systems. CRC Press LLC, Washington D.C., USA.León, C., Martín, S., Elena, J.M., Luque, J. (2000). EXPLORE - Hybrid expert system for water networks management. Journal of Water Resources Planning and Management, 126(2), 65-74. doi:10.1061/(ASCE)0733-9496(2000)126:2(65)Mackintosh, G., Colvin, C. (2003). Failure of rural schemes in South Africa to provide potable water. Environmental Geology, 44(1), 101-105. doi:10.1007/s00254-002-0704-yMakropoulos, C.K., Natsis, K., Liu, S., Mittas, K., Butler, D. (2008). Decision support for sustainable option selection in integrated urban water management. Environmental Modelling & Software, 23(12), 1448-1460. doi:10.1016/j.envsoft.2008.04.010Muthusi, F.M., Mahamud, G., Abdalle, A., Gadain, H.M. (2007). Rural Water Supply Assessment, Technical Report No-08, FAOSWALIM, Nairobi, Kenya. Disponível em: http://sddr.faoswalim.org/Documents_Repository/water_reports/W-08%20Rural%20Water%20Supply%20Assessment.pdf. Acesso em: 12 de mai. 2016.Nicochelli, L.M., Siqueira, A.J.B., Migliorini, R.B., Albrecht, K.J., Delguingaro, A.R. (2009). Análise de vulnerabilidade à contaminação de aqüífero no Distrito Industrial de Cuiabá - MT, através do método GOD. Anais do 14° Simpósio Brasileiro de Sensoriamento Remoto, Abril 25-30, São José dos Campos, Brasil, 4109-4116.PMSS. (2008). Municipalização dos Serviços de Abastecimento de Água e de Esgotamento Sanitário no Estado de Mato Grosso. Brasília. Disponível em: http://www.pmss.gov.br/. Acesso em: 29 de abr. 2011.Porto, A.L.L., Lanna, A.E.L., Braga Jr., B.P.F., Cirilo, J.A., Jahed Filho, K., Gobetti, L., Azevedo, L.G.T., Barros, M.T.L., Barbosa, P.S.F. (2002). Técnicas quantitativas para o gerenciamento de recursos hídricos. UFRGS/ABRH, Porto Alegre, BRA.Porto, R.M. (2001). Sistemas hidráulicos de tubulações. Em: Hidráulica Básica (R.M. Porto, ed.). EESC-USP, São Paulo, BRA, 93-117.Reis, M.G.C. (2004). Estabelecendo parcerias - ampliação da rede de abastecimento de água e implantação de sistema de esgotamento sanitário por meio de mutirão - a experiência do serviço autônomo de água e esgoto de Alagoinhas-BA. Anais do 2° Seminário Internacional de Engenharia de Saúde Pública, Dezembro 1-3, Goiânia, Brasil, 929-935.RWSN. (2010). Myths of the Rural Water Supply Sector. St.Gallen. Disponível em: http://www.ircwash.org/sites/default/files/RWSN-2010-Myths.pdf. Acesso em: 14 de mai. 2016.Sadeghi, G.H., Mohammadian, M., Nouran, M., Peyda, M., Eslami, A. (2007). Microbiological Quality Assessment of Rural Drinking Water Supplies in Iran. Journal of Agriculture & Social Sciences, 3(1), 31-33.Souza, K.S., Dutra, L.K.A., Rêgo, N.F.L., Silva, J.F. (2015). Levantamento das condições de saneamento na comunidade km 32, zona rural de Barreiras-BA. Anais do 21° Simpósio Brasileiro de Recursos Hídricos, Novembro 22-27, Brasília. Brasil, 1-8.Tsutiya, M.T. (2006). Redes de distribuição de água. Em: Abastecimento de água (M.T. Tsutiya, ed.). PHA-EPUSP, São Paulo, São Paulo, BRA, 389-455.Xie, X.F., Zhang, W.J., Yang, Z.L., (2002). Social cognitive optimization for nonlinear programming problems. Proceedings of the First International Conference on Machine Learning and Cybernetics, November 4-5, Beijing, CHN, 779-783.Zyl, J.E., Savic, D.A., Walters, G.A. (2004). Operational optimization of water distribution systems using a hybrid genetic algorithm. Journal of Water Resources Planning and Management, 130(2), 160-170. doi:10.1061/(ASCE)0733-9496(2004)130:2(160

    Search for invisible Higgs boson decays in vector boson fusion at √s = 13 TeV with the ATLAS detector

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    We report a search for Higgs bosons that are produced via vector boson fusion and subsequently decay into invisible particles. The experimental signature is an energetic jet pair with invariant mass of O(1) TeV and O(100) GeV missing transverse momentum. The analysis uses 36.1 fb−1 of pp collision data at √s=13 TeV recorded by the ATLAS detector at the LHC. In the signal region the 2252 observed events are consistent with the background estimation. Assuming a 125 GeV scalar particle with Standard Model cross sections, the upper limit on the branching fraction of the Higgs boson decay into invisible particles is 0.37 at 95% confidence level where 0.28 was expected. This limit is interpreted in Higgs portal models to set bounds on the wimp–nucleon scattering cross section. We also consider invisible decays of additional scalar bosons with masses up to 3 TeV for which the upper limits on the cross section times branching fraction are in the range of 0.3–1.7 pb

    Observation of photon-induced W<sup>+</sup>W<sup>−</sup> production in pp collisions at √s=13 TeV using the ATLAS detector

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    This letter reports the observation of photon-induced production of W-boson pairs, γγ→ WW. The analysis uses 139 fb-1 of LHC proton-proton collision data taken at √s=13 TeV recorded by the ATLAS experiment during the years 2015-2018. The measurement is performed selecting one electron and one muon, corresponding to the decay of the diboson system as WW→e±νμ∓ν final state. The background-only hypothesis is rejected with a significance of well above 5 standard deviations consistent with the expectation from Monte Carlo simulation. A cross section for the γγ→ WW process of 3.13±0.31(stat.)±0.28(syst.) fb is measured in a fiducial volume close to the acceptance of the detector, by requiring an electron and a muon of opposite signs with large dilepton transverse momentum and exactly zero additional charged particles. This is found to be in agreement with the Standard Model prediction

    Comparison between simulated and observed LHC beam backgrounds in the ATLAS experiment at Ebeam =4 TeV

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    Results of dedicated Monte Carlo simulations of beam-induced background (BIB) in the ATLAS experiment at the Large Hadron Collider (LHC) are presented and compared with data recorded in 2012. During normal physics operation this background arises mainly from scattering of the 4 TeV protons on residual gas in the beam pipe. Methods of reconstructing the BIB signals in the ATLAS detector, developed and implemented in the simulation chain based on the \textscFluka Monte Carlo simulation package, are described. The interaction rates are determined from the residual gas pressure distribution in the LHC ring in order to set an absolute scale on the predicted rates of BIB so that they can be compared quantitatively with data. Through these comparisons the origins of the BIB leading to different observables in the ATLAS detectors are analysed. The level of agreement between simulation results and BIB measurements by ATLAS in 2012 demonstrates that a good understanding of the origin of BIB has been reached

    Measurement of the total cross section and ρ -parameter from elastic scattering in pp collisions at √s=13 TeV with the ATLAS detector

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    In a special run of the LHC with β⋆=2.5 km, proton–proton elastic-scattering events were recorded at s√=13 TeV with an integrated luminosity of 340 μb−1 using the ALFA subdetector of ATLAS in 2016. The elastic cross section was measured differentially in the Mandelstam t variable in the range from −t=2.5⋅10−4 GeV2 to −t=0.46 GeV2 using 6.9 million elastic-scattering candidates. This paper presents measurements of the total cross section σtot, parameters of the nuclear slope, and the ρ-parameter defined as the ratio of the real part to the imaginary part of the elastic-scattering amplitude in the limit t→0. These parameters are determined from a fit to the differential elastic cross section using the optical theorem and different parameterizations of the t-dependence. The results for σtot and ρ are σtot(pp→X)=104.7±1.1 mb ,ρ=0.098±0.011. The uncertainty in σtot is dominated by the luminosity measurement, and in ρ by imperfect knowledge of the detector alignment and by modelling of the nuclear amplitude.publishedVersio
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