Open heavy flavour and quarkonium production as a function of the multiplicity in pp and p-Pb collisions with ALICE at the LHC

Due to the large masses of beauty and charm quarks, their production cross sections can be computed in the framework of perturbative Quantum Chromodynamics. The correlation of quarkonium and open heavy-flavour hadron yields with charged particles produced in proton-proton (pp) and proton-lead (p-Pb) collisions can shed light on the interplay between hard and soft mechanisms in particle production. In this proceeding the results from D-meson and J/$\psi$ yields as a function of the charged-particle multiplicity in pp and p-Pb collisions are presented. Comparisons to theoretical models are also discussed.Comment: 7 pages, 3 figures, Proceedings of the 8th International Workshop on Multiple Partonic Interactions at the LHC, Chiapas, Mexic

A review of convex approaches for control, observation and safety of linear parameter varying and Takagi-Sugeno systems

This paper provides a review about the concept of convex systems based on Takagi-Sugeno, linear parameter varying (LPV) and quasi-LPV modeling. These paradigms are capable of hiding the nonlinearities by means of an equivalent description which uses a set of linear models interpolated by appropriately defined weighing functions. Convex systems have become very popular since they allow applying extended linear techniques based on linear matrix inequalities (LMIs) to complex nonlinear systems. This survey aims at providing the reader with a significant overview of the existing LMI-based techniques for convex systems in the fields of control, observation and safety. Firstly, a detailed review of stability, feedback, tracking and model predictive control (MPC) convex controllers is considered. Secondly, the problem of state estimation is addressed through the design of proportional, proportional-integral, unknown input and descriptor observers. Finally, safety of convex systems is discussed by describing popular techniques for fault diagnosis and fault tolerant control (FTC).Peer ReviewedPostprint (published version

On control of discrete-time state-dependent jump linear systems with probabilistic constraints: A receding horizon approach

In this article, we consider a receding horizon control of discrete-time state-dependent jump linear systems, particular kind of stochastic switching systems, subject to possibly unbounded random disturbances and probabilistic state constraints. Due to a nature of the dynamical system and the constraints, we consider a one-step receding horizon. Using inverse cumulative distribution function, we convert the probabilistic state constraints to deterministic constraints, and obtain a tractable deterministic receding horizon control problem. We consider the receding control law to have a linear state-feedback and an admissible offset term. We ensure mean square boundedness of the state variable via solving linear matrix inequalities off-line, and solve the receding horizon control problem on-line with control offset terms. We illustrate the overall approach applied on a macroeconomic system

Actuator and sensor fault estimation based on a proportional-integral quasi-LPV observer with inexact scheduling parameters

© 2019. ElsevierThis paper presents a method for actuator and sensor fault estimation based on a proportional-integral observer (PIO) for a class of nonlinear system described by a polytopic quasi-linear parameter varying (qLPV) mathematical model. Contrarily to the traditional approach, which considers measurable or unmeasurable scheduling parameters, this work proposes a methodology that considers inexact scheduling parameters. This condition is present in many physical systems where the scheduling parameters can be affected by noise, offsets, calibration errors, and other factors that have a negative impact on the measurements. A H8 performance criterion is considered in the design in order to guarantee robustness against sensor noise, disturbance, and inexact scheduling parameters. Then, a set of linear matrix inequalities (LMIs) is derived by the use of a quadratic Lyapunov function. The solution of the LMI guarantees asymptotic stability of the PIO. Finally, the performance and applicability of the proposed method are illustrated through a numerical experiment in a nonlinear system.Peer ReviewedPostprint (author's final draft

ANÁLISIS DE RESULTADOS DEL EXAMEN SER BACHILLER EN EL DOMINIO MATEMÁTICO

El examen Ser Bachiller (2016) es un instrumento que evalúa las destrezas y aptitudes del postulante con la finalidad de obtener el título de bachiller y contar con un cupo en las instituciones de educación superior en el Ecuador. Por otro lado, el dominio matemático desarrolla múltiples habilidades que ayudan a afrontar diversas situaciones en la vida real; sin embargo, los datos demuestran que en este dominio los estudiantes tienen menor puntuación. Por esta razón, el objetivo de la presente investigación es analizar la correlación entre el puntaje del dominio matemático con el tipo de sostenimiento de las instituciones educativas (IE) en que el estudiante cursó sus estudios secundarios y la segregación de la población por el índice socioeconómico; adicionalmente, se busca las mejores puntuaciones en dicho dominio por la ubicación geográfica. Para el logro de los objetivos se utilizó la base de datos proporcionada por el Instituto Nacional de Evaluación Educativa en su sitio web oficial de los períodos 2016-2017, 2017-2018 y 2018-2019 mediante un análisis exploratorio y filtración de los datos. Como resultado se obtuvo que existen diferencias significativas del puntaje del dominio matemático con el tipo de sostenimiento de las IE y el índice socioeconómico respectivamente; además, las puntuaciones más altas en los tres períodos de estudios se encuentran en la provincia de Tungurahua. Como conclusión los estudiantes de instituciones educativas municipales y particulares obtienen mejores puntuaciones en el dominio matemático, al igual de aquellos que pertenecen al quintil 5 (población más pudiente), por otro lado, en la provincia de Tungurahua, y sus cantones de Pelileo, Quero y Cevallos fueron los que sacaron las mejores puntuaciones en este dominio matemático en los 3 años consecutivos. PALABRAS CLAVE: Ser Bachiller; dominio matemático; tipo de sostenimiento; índice socioeconómico; ubicación geográfica. ANALYSIS OF RESULTS OF THE SER BACHILLER EXAM IN THE MATHEMATICAL DOMAIN ABSTRACT The Ser Bachiller exam (2016) is an instrument that evaluates the skills and aptitudes of the applicant in order to obtain the bachelor's degree and have a quota for higher education institutions. On the other hand, the mathematical domain develops several skills that help to face different situations in real life, however, the data show that in this domain the students have lower scores. For this reason, the objective of this research is to analyze the correlation between the mathematical proficiency score with the type of support of the educational institutions in which the student attended secondary school and the segregation of the population by the socioeconomic index; Additionally, the best scores in that domain are searched for by geographic location. For the achievement of the objectives, the database provided on the official website of the National Institute for Educational Evaluation for the periods 2016-2017, 2017-2018 and 2018-2019 was used through an exploratory analysis and data filtration. As a result, it was obtained that there are significant differences in the mathematical proficiency score with the type of EI support and the socioeconomic index respectively, and the highest scores in the three study periods are found in the province of Tungurahua. In conclusion, students from municipal and private educational institutions obtain better scores in the mathematical domain, as well as those who belong to quintile 5 (the wealthiest population), on the other hand, in the parishes of Tungurahua there are better scores in this domain. KEYWORDS: Ser Bachiller; mathematical domain type of support; socioeconomic index; geographic location

Sinteza sustava upravljanja s proporcionalno-derivacijskim regulatorom zasnovana na neizrazitim diferencijalnim jednadžbama

This paper reports a fuzzy differential equations approach for the modeling of initial condition uncertainty for a proportional derivative closed-loop control of a direct current motor. Uncertainties are considered on the precision of the sensing devices installed on a driver. The closed-loop system is designed for a plant modeled with fuzzy differential equations. Satisfactory analytic and numerical results for the position regulation problem for ideal case and also considering perturbed initial conditions are reported.U radu je razvijen postupak sinteze proporcionalno-derivacijskog regulatora za upravljanje istosmjernim motorom s neizrazitim (engl. fuzzy) početnim uvjetima zasnovane na neizrazitim diferencijalnim jednadžbama. Pritom je uzeta u obzir nesigurnost određena mjernom preciznošću senzora. U predloženom postupku se zatvoreni regulacijski krug dizajnira korištenjem neizrazitih diferencijalnih jednadžbi. Primjenom projektiranog regulatora na probleme pozicioniranja u idealnom slučaju te u slučaju koji uzima u obzir perturbirane početne uvjete ostvareni su zadovoljavajući analitički i numerički rezultati

Pressure sensor placement for leak localization in water distribution networks using information theory

This paper presents a method for optimal pressure sensor placement in water distribution networks using information theory. The criterion for selecting the network nodes where to place the pressure sensors was that they provide the most useful information for locating leaks in the network. Considering that the node pressures measured by the sensors can be correlated (mutual information), a subset of sensor nodes in the network was chosen. The relevance of information was maximized, and information redundancy was minimized simultaneously. The selection of the nodes where to place the sensors was performed on datasets of pressure changes caused by multiple leak scenarios, which were synthetically generated by simulation using the EPANET software application. In order to select the optimal subset of nodes, the candidate nodes were ranked using a heuristic algorithm with quadratic computational cost, which made it time-efficient compared to other sensor placement algorithms. The sensor placement algorithm was implemented in MATLAB and tested on the Hanoi network. It was verified by exhaustive analysis that the selected nodes were the best combination to place the sensors and detect leaksPeer ReviewedPostprint (published version

Using the second-order information for reconfigurability analysis and design in the fault tolerant framework

The control reconfigurability measure defines the capability of a control system to allow recovery of performance when faults occur; therefore, it has been intended to be a tool for designing and synthesizing approaches in the fault tolerant control context. Reconfigurability depends on the controllability gramian, also known as the second-order information (SOI) in a broad sense. This paper proposes the assignation, by feedback, of the deterministic SOI in order to set the control reconfigurability of a given linear system. The theory concerned with this assignation is reviewed, then constructive theorems are given for finding constant feedback gains that approximate a required control reconfigurability for ease implementation. Also an unification of the reconfigurability measures proposed in the fault tolerance literature is given. Once the SOI is assigned by feedback, it can be computed online by using an identification method, which uses process input/output data. Results from simulation of the three tanks hydraulic benchmark, show that this approach can provide information about the system performance for fault tolerant purposes, thus online control reconfigurability computation and fault accommodation are considered. The approach presented in the paper gives an alternative for supervision taking into account the reconfigurability assigned by design