Search results for " Uncertainty"

A mathematical model for a sequential batch membrane bioreactor pilot plant

2016

A mathematical model to quantify the nitrogen removal for a membrane bioreactor (MBR) has been presented in this study. The model has been applied to a pilot plant having a pre-denitrification MBR scheme. The pilot plant was cyclically filled with real saline wastewater according to the fill-draw-batch operation. The model was calibrated by adopting a specific protocol based on extensive field dataset. The Standardized Regression Coefficient (SRC) method was adopted to select the most influential model factors to be calibrated. Results related to the SRC method have shown that model factors of the efficiency of backwashing and the biological factors affecting the soluble microbial products …

Parameter uncertainty analysis of water quality model for small river

2009

A new integrated MBR model for wastewater treatment: sensitivity and uncertainty analysis

2017

In this study a new integrated membrane bioreactor (MBR) model is proposed. The model is able to describe the main biological processes aimed at the carbon and the nutrients (nitrogen, N and phosphorus, P) removal coupled with the soluble microbial products (SMP) formation/degradation. Furthermore, the model describes the key physical processes and the interconnection between SMP and membrane fouling. The model was calibrated by adopting data measured during the monitoring of a University Cape Town (UCT) MBR pilot plant. A sensitivity analysis allowed the reduction of the number of model FACTORs to be calibrated from 122 to 45. A good correlation between measured and simulated data was obta…

ERROR AND UNCERTAINTY ANALYSIS OF RESIDUAL STRESS EVALUATION BY USINGTHE RING-CORE METHOD

2014

The Ring-Core Method is a technique used for the experimental analysis of the residual stresses in mechanical components. For uniform and non-uniform residual stresses estimation, the use of the method leads in general to accurate results but, unfortunately at present the user does not have appropriate procedures to correct the obtained results from systematic errors as well as to estimate the uncertainty due to random errors. In order to overcome such drawbacks, in the present work, the procedures for the correction of the effects of the main error sources and for the stress uncertainty estimation, are proposed. The practical application of such procedures allow the user to highlight the r…

ERROR AND UNCERTAINTY ANALYSIS OF THE RESIDUAL STRESSES COMPUTED BY USING THE HOLE DRILLING METHOD

2011

The hole-drilling method is one of the most used techniques for the experimental analysis of the residual stresses in mechanical components. For both through-thickness uniform and non-uniform residual stresses, its practical application is standardised by the ASTM E837-08. For uniform residual stresses, to which the present work deals with, the use of the method in accordance with the ASTM limitations, leads to results with a bias of about 10%. Unfortunately, although some experimental parameters can be frequently out of the corresponding standard limitation, the user does not have appropriate procedures to correct the obtained results which, in accordance with the ASTM standard, have to be…

Robust Discrete-Time Lateral Control of Racecars by Unknown Input Observers

2023

This brief addresses the robust lateral control problem for self-driving racecars. It proposes a discrete-time estimation and control solution consisting of a delayed unknown input-state observer (UIO) and a robust tracking controller. Based on a nominal vehicle model, describing its motion with respect to a generic desired trajectory and requiring no information about the surrounding environment, the observer reconstructs the total force disturbance signal, resulting from imperfect knowledge of the time-varying tire-road interface characteristics, presence of other vehicles nearby, wind gusts, and other model uncertainty. Then, the controller actively compensates the estimated force and as…

Electron structure, ultra-dense hydrogen and low energy nuclear reactions

2019

In this paper, a simple Zitterbewegung electron model, proposed in a previous work, is presented from a different perspective based on the principle of mass- frequency equivalence. A geometric- electromagnetic interpretation of mass, relativistic mass, De Broglie wavelength, Proca, Klein- Gordon, Dirac and Aharonov- Bohm equations in agreement with the model is proposed. A non-relativistic, Zitterbewegung interpretation of the 3.7 keV deep hydrogen level found by J. Naudts is presented. According to this perspective, ultra-dense hydrogen can be conceived as a coherent chain of bosonic electrons with protons or deuterons located in the center of their Zitterbewegung orbits. This approach sug…

Medical image registration: Interpolations, similarities and optimizations strategies

2010

This paper presents a study conducted for evaluating different interpolation schemes, similarity metrics and optimization algorithms for the purpose of volumetric medical image registration. Each technique has been implemented to be plugged in a modular system. Rotation, translation and scale error has been measured to obtain a performance evaluation for all of the combinations of the considered techniques. Several experimental tests were conducted for validation both on synthetic and real datasets providing an exhaustive overview of the various strategies used.

Agamennone βουληφόρος? La sovranità alla prova del processo deliberativo

2022

Starting with the Iliad, Agamemnon is mostly depicted at the centre of dramatic deliberative situations. This feature is also present in fifth-century literature, particularly in some plays in which Agamemnon’s decision-making ability in uncertainty comes into tension with other characters in order to determine the ‘right’ decision and adequate leadership features. In this paper, I will focus on the Euripides’ play Iphigenia in Aulis (405 a.C.). In this tragedy the behaviour of the Achaean king draws our attention, as he is not equipped to handle his role and responsibilities. In the same years, also historiography is interested in the nature and risks of the deliberative process, as Thucyd…

Merito, responsabilità e incertezza nel dibattito su Mitilene (Tucidide III 39 ss.)

2017

Questo contributo analizza le due sezioni esordiali dell’antilogia di Cleone e Diodoto sulla punizione da infliggere ai Mitilenesi per la loro rivolta, presentata da Tucidide nel III libro. Nei due incipit, così come in altri punti chiave dell’agone retorico, gli oratori definiscono le categorie di “responsabilità” e “responsabilizzazione”, “titolo” e “merito”. Attraverso la contrapposizione tra i due discorsi, Tucidide mette in luce l’“incertezza” come condizione necessaria e qualificante di una autentica “deliberazione”. This paper analyzes the introductive sections in the antilogical speeches of Cleon and Diodotus on the punishment that Mytileneans deserve for their revolt (Thucydides, b…