problem generation
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2021 ◽  
Author(s):  
Fernando Otero

This article analyzes the performance of combining information from Scanning Electron Microscopy(SEM) micrographs with Static Light Scattering (SLS) measurements for retrieving the so-called ParticleSize Distribution (PSD) in terms of experimental features. The corresponding data fusion is implementedusing a novel Monte Carlo-based method consisting in a SMF (Sampling-Mapping-Filtering) approach.This approach provides an important reference to assess the strategy of the experiment for this specificproblem by means of solving an inverse problem. Furthermore, low levels of volume fraction and a PSDrepresented by log-normal distributions are considered in order to reduce processing and model errors dueto ill-posedness. The prior statistics corresponding to the SEM micrographs have been achieved by meansof the Jackknife procedure used as a resampling technique. The likelihood term considers iid normalmeasurements generated from the Local Monodisperse Approximation (LMA) and also makes use of thesame model as forward linear model, in an inversion case known as inverse crime. However, it has beenproved that the LMA performs well in practice for low fraction volume systems as considered here. ThePSD retrieval is measured in terms of improvement in precision with respect to one of the log-normalparameters in SEM micrographs, i.e., the desirability. Estimates are expressed as a function of a typicalsystem parameter such as polydispersity, as well as experimental variables, i.e., number of particles permicrograph (PPM) and noise level ε in the SLS measurements. These estimations are then analyzed bymeans of the Box-Behnken (BB) design and the response surface methodology (RSM) in order to generatea surrogate model from which rules for the optimization of the experiment are made when desirability ismaximized. Finally, a Rule-Based System (RBS) is proposed for future use.


2021 ◽  
Author(s):  
Tianqiao Liu ◽  
Qiang Fang ◽  
Wenbiao Ding ◽  
Hang Li ◽  
Zhongqin Wu ◽  
...  

2019 ◽  
pp. 105-112
Author(s):  
Kristina Mezapuke ◽  
Rute Bendere ◽  
Dz. Zarina ◽  
L. Dubova

Protection of environment is a worldwide problem. Generation of organic waste is increasingand strategies for its environmentally sound use must be developed and optimised.Accumulation of great quantities of organic wastes leads to the serious environmentalproblems: polluted water, contaminated soils, polluted air and solid wastes. Waste watertreatment plants produce in large quantities sewage sludge. Among the different types ofmunicipal organic wastes sewage sludge is the main product.Waste Management plan for Latvia sets that disposed biodegradable waste amount till 2010must not exceed 75 % from the biodegradable waste amount disposed in 1995. Proposal forthe Strategy on biodegradable waste management were elaborated by Waste ManagementAssociation of Latvia (WMAL), and in collaboration with Institute of Microbiology andBiotechnology, University of Latvia an approbation of organic municipal waste compostingtechnologies is performed in the frames of LIFE - ENVIRONMENT program project in Rigadistrict.


2019 ◽  
Vol 64 ◽  
pp. 27-63
Author(s):  
Ouail Al Maghraoui ◽  
Flore Vallet ◽  
Jakob Puchinger ◽  
Bernard Yannou

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1637 ◽  
Author(s):  
Ho Min Lee ◽  
Donghwi Jung ◽  
Ali Sadollah ◽  
Do Guen Yoo ◽  
Joong Hoon Kim

Engineering benchmark problems with specific characteristics have been used to compare the performance and reliability of metaheuristic algorithms, and water distribution system design benchmarks are also widely used. However, only a few benchmark design problems have been considered in the research community. Due to the limited set of previous benchmarks, it is challenging to identify the algorithm with the best performance and the highest reliability among a group of algorithms. Therefore, in this study, a new water distribution system design benchmark problem generation method is proposed considering problem size and complexity modifications of a reference benchmark. The water distribution system design benchmark problems are used for performance and reliability comparison among several reported metaheuristic optimization algorithms. The optimal design results are able to quantify the performance and reliability of the compared algorithms which shows each metaheuristic algorithm has its own strengths and weaknesses. Finally, using the proposed method in this study, guidelines are derived for selecting an appropriate metaheuristic algorithm for water distribution system design.


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