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    Closure to “Dealing with Zero Flows in Solving the Nonlinear Equations for Water Distribution Systems” by Sylvan Elhay and Angus R. Simpson 

    Source: Journal of Hydraulic Engineering:;2013:;Volume ( 139 ):;issue: 005
    Author(s): Sylvan Elhay; Angus R. Simpson
    Publisher: American Society of Civil Engineers
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    Closure to “Jacobian Matrix for Solving Water Distribution System Equations with the Darcy-Weisbach Head-Loss Model” by Angus Simpson and Sylvan Elhay 

    Source: Journal of Hydraulic Engineering:;2012:;Volume ( 138 ):;issue: 011
    Author(s): Angus R. Simpson; Sylvan Elhay
    Publisher: American Society of Civil Engineers
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    Evaluating the Approximation of the Affinity Laws and Improving the Efficiency Estimate for Variable Speed Pumps 

    Source: Journal of Hydraulic Engineering:;2013:;Volume ( 139 ):;issue: 012
    Author(s): Angus R. Simpson; Angela Marchi
    Publisher: American Society of Civil Engineers
    Abstract: Affinity laws relate to the characteristics of pumps operating at different speeds, and in a water distribution context, are usually used to predict the pump curve of variable speed pumps (VSPs). VSPs can adjust the pump ...
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    Dealing with Zero Flows in Solving the Nonlinear Equations for Water Distribution Systems 

    Source: Journal of Hydraulic Engineering:;2011:;Volume ( 137 ):;issue: 010
    Author(s): Sylvan Elhay; Angus R. Simpson
    Publisher: American Society of Civil Engineers
    Abstract: Three issues concerning the iterative solution of the nonlinear equations governing the flows and heads in a water distribution system network are considered. Zero flows cause a computation failure (division by zero) when ...
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    Pipeline Column Separation Flow Regimes 

    Source: Journal of Hydraulic Engineering:;1999:;Volume ( 125 ):;issue: 008
    Author(s): Anton Bergant; Angus R. Simpson
    Publisher: American Society of Civil Engineers
    Abstract: A generalized set of pipeline column separation equations is presented describing all conventional types of low-pressure regions. These include water hammer zones, distributed vaporous cavitation, vapor cavities, and shocks ...
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    Numerical Comparison of Pipe‐Column‐Separation Models 

    Source: Journal of Hydraulic Engineering:;1994:;Volume ( 120 ):;issue: 003
    Author(s): Angus R. Simpson; Anton Bergant
    Publisher: American Society of Civil Engineers
    Abstract: Results comparing six column‐separation numerical models for simulating localized vapor cavities and distributed vaporous cavitation in pipelines are presented. The discrete vapor‐cavity model (DVCM) is shown to be quite ...
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    Erratum for “Jacobian Matrix for Solving Water Distribution System Equations with the Darcy-Weisbach Head-Loss Model” by Angus Simpson and Sylvan Elhay 

    Source: Journal of Hydraulic Engineering:;2017:;Volume ( 143 ):;issue: 009
    Author(s): Angus R. Simpson; Sylvan Elhay
    Publisher: American Society of Civil Engineers
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    Correction of the <i>EPANET</i> Inaccuracy in Computing the Efficiency of Variable Speed Pumps 

    Source: Journal of Water Resources Planning and Management:;2013:;Volume ( 139 ):;issue: 004
    Author(s): Angela Marchi; Angus R. Simpson
    Publisher: American Society of Civil Engineers
    Abstract: One attractive possibility for saving energy in water distribution systems is the introduction of variable speed pumps (VSPs). However, to assess the cost effectiveness of using VSPs, a correct estimate of VSP energy ...
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    Large Water‐Hammer Pressures for Column Separation in Pipelines 

    Source: Journal of Hydraulic Engineering:;1991:;Volume ( 117 ):;issue: 010
    Author(s): Angus R. Simpson; E. Benjamin Wylie
    Publisher: American Society of Civil Engineers
    Abstract: Water-hammer pressures in a pipeline due to the collapse of a vapor cavity adjacent to a valve are investigated. A water-hammer event is initiated by the closure of a valve in a simple reservoir-pipeline-valve system. The ...
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    Expert System for Water Treatment Plant Operation 

    Source: Journal of Environmental Engineering:;1996:;Volume ( 122 ):;issue: 009
    Author(s): Xin X. Zhu; Angus R. Simpson
    Publisher: American Society of Civil Engineers
    Abstract: An expert system based on a combination of forward chaining, backward chaining, and metarules has been developed for water treatment plant operations. The expert system was developed by interviewing a number of plant ...
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