On the nonlinear Dysthe equation

This work is dedicated to putting on a solid analytic ground the theory of local well-posedness for the two dimensional Dysthe equation. This equation can be derived from the incompressible Navier-Stokes equation after performing an asymptotic expansion of a wavetrain modulation to the fourth order. Recently, this equation has been used to numerically study rare phenomena on large water bodies such as rogue waves. In order to study well-posedness, we use Strichartz, and improved smoothing and maximal function estimates. We follow ideas from the pioneering work of Kenig, Ponce and Vega, but since the equation is highly anisotropic, several technical challenges had to be resolved. We conclude our work by also presenting an ill-posedness result.Comment: Some remarks and references adde

Alta disponibilidad 24/7 : el reto

En la actualidad, las actividades diarias para los ne- gocios, instituciones, instituciones educativas o nivel de usuario común están directamente vinculadas a la red de redes, la Internet. Su desarrollo ha permitido a la mayoría de los servicios y aplicaciones, que hace años eran sólo para el modo cliente-servidor, ahora acceder desde cualquier lugar en cualquier dispositi- vo con conexión a Internet. Por lo tanto, ofrecer un ambiente que da conexiones y transacciones 7/24 es necesario para cada empresa e institución con servicios en línea. Sin embargo, es una premisa difícil de cumplir

Wavelet Analysis to Detect Ground Faults in Electrical Power Systems with Full Penetration of Converter Interface Generation

The requirements for the increased penetration of renewable energy sources in electrical power systems have led to a dominance of power electronic interfaces. As a result, short-circuit currents have been reduced by the thermal limitations of power electronics, leading to problems associated with the sensitivity, selectivity, and reliability of protective relays. Although many solutions can be found in the literature, these depend on communications and are not reliable in all grid topologies or under different types of electrical fault. Hence, in this paper, the analysis of ground fault currents and voltages using a wavelet transform in combination with a new algorithm not only detects such ground faults but also allows them to be cleared quickly and selectively in scenarios with low fault current contribution due to a full penetration converter-interface-based generation. To verify and validate the proposed protection system, different ground faults are simulated using an arc ground fault model in a grid scheme based on the IEEE nine-bus standard test system, with only grid-forming power converters as generation sources. The test system is modelled in the MATLAB/Simulink environment. Therefore, the protection relays that verify all the steps established in the new algorithm can detect and clear any ground defect. Simulations are also presented involving different fault locations to demonstrate the effectiveness of the proposed ground fault protection method.This work was supported by the Autonomous Community of Madrid under the PROMINT-CM project (S2018/EMT-4366)

The psychological status of primary pragmatic processes in the Truth-Conditional Pragmatics

El propósito del presente trabajo es examinar las propiedades psicológicas que Recanati atribuye a los procesos pragmáticos primarios en su defensa de la Pragmática de las Condiciones de Verdad. Tal análisis revela una tensión entre dos de las principales intuiciones de las que la Pragmática de las Condiciones de Verdad pretende dar cuenta. Este análisis pone de manifiesto que la afirmación de que los procesos pragmáticos primarios son cognitivamente penetrables permite una interpretación fuerte y una interpretación débil de la Condición de Disponibilidad. La interpretación débil compromete los fundamentos de la Pragmática de las Condiciones de Verdad.The main purpose of the present work is the analysis of the psychological properties attributed by Recanati to the primary pragmatic processes in his defense of the Truth-Conditional Pragmatics. Such analysis reveals a tension between two of the main intuitions that the Truth-Conditional Pragmatics seeks to explain.The analysis carried out by the author shows that the claim that the primary pragmatic processes are cognitively penetrable yields a weak and a strong interpretation of the Availability Condition. The later undermines the grounds of Truth-Conditional Pragmatics

The applicability of mathematics to physics

Orientador: Jairo José da SilvaTese (doutorado) - Universidade Estadual de Campinas, Instituto de Filosofia e Ciências HumanasResumo: O propósito deste trabalho é mostrar o porquê de conceitos matemáticos serem úteis à descrição de fenômenos da nossa realidade empírica sem termos de nos comprometer com a existência de objetos abstratos. Por meio da análise do desenvolvimento da mecânica quântica não-relativística de Werner Heisenberg, procuramos mostrar como se dá relação entre os conceitos da matemática pura e os conceitos da mecânica quântica. Após a análise da tese de Mark Steiner a respeito da aplicabilidade da matemática à física, expomos nosso ponto de vista com base em algumas das idéias estruturalistas elaboradas por Jairo José da SilvaAbstract: The purpose of this work is to show why mathematical concepts are useful to describe phenomena of our empirical reality without having to commit ourselves to the existence of abstract objects. By analyzing the development of Heisenberg's non-relativistic quantum mechanics, we show how mathematical and quantum mechanical concepts are related to each other. After the analysis of Mark Steiner's thesis on the applicability of mathematics, we expose our own point of view, which was based on some ideas on structuralism due to Jairo José da SilvaDoutoradoFilosofiaDoutor em Filosofi

Relação entre depressão materna como fator de risco para trauma na infância e transtornos de humor em jovens

Background Maternal depression may be a risk factor for childhood trauma (CT), with resultant offspring development of mood disorders (MD) in adult life. Objective To verify the relationship between maternal depression (as a risk factor for childhood trauma) and mood disorders in young adults. Methods The sample was composed of 164 young adults and their mothers. Maternal depression was identified through the Mini International Neuropsychiatric Interview (M.I.N.I.). Mood Disorders in the young adults were confirmed with the Structured Interview for the DSM-IV (SCID), whereas the CT was evaluated using the Childhood Trauma Questionnaire (CTQ). Results In the group of young adults with MD, individuals who had depressed mothers presented higher mean scores of CT in comparison to the ones who did not have mothers with Depression (p < 0.005). Childhood trauma was also associated with lower social classes (p < 0.005). In the group of young adults without MD, the only variable that was associated with CT was the young adult’s (not) current work (p < 0.005). Discussion Maternal depression was considered to be a risk factor for CT and MD in young adults. Thus, preventing and treating maternal psychiatric disorders may diminish the risk of offspring childhood trauma, and, consequently, avoid negative effects in the offspring’s adult life.Contexto Depressão materna pode ser um fator de risco para trauma na infância (TI), com consequente desenvolvimento de transtornos de humor (TH) em seus filhos na vida adulta. Objetivo Verificar a relação entre depressão materna (como fator de risco para TI) e TH em jovens. Métodos A amostra foi composta de 164 jovens adultos e suas mães. A depressão materna foi identificada por meio do Mini International Neuropsychiatric Interview (M.I.N.I.). Transtornos de humor nos jovens foram confirmados pela entrevista estruturada para o DSM-IV (SCID), enquanto o TI foi avaliado pelo Questionário de Trauma na Infância (CTQ). Resultados No grupo de jovens com TH, indivíduos que tiveram mães deprimidas apresentaram escores médios de TI mais altos em comparação aos que não tinham mães com depressão (p < 0,05). Trauma na infância também esteve associado com classes sociais desfavorecidas (p < 0,05). No grupo de jovens sem TH, a única variável associada ao TI foi o (não) trabalho do jovem (p < 0,05). Conclusões A depressão materna foi considerada fator de risco para TI e TH nos jovens. Portanto, prevenir e tratar transtornos psiquiátricos maternos pode diminuir o risco de trauma infantil no filho e, por consequência, evitar efeitos negativos na vida adulta da prole

Real-Time Implementation of Two Grid-Forming Power Converter Controls to Emulate Synchronous Generators

Modern power systems are experiencing unprecedented penetration of integrating renewable energy sources (RES) to tackle the so-called climate emergency. But the transition from synchronous generators to converter-interfaced generators also produces a few issues, some of them directly related to the reduction (or lack) of rotational inertia. The voltage source converters (VSCs) enabled with the so-called grid-forming control may provide a solution for the converter-dominated electrical power systems. This paper presents the implementation of two control strategies, Virtual Synchronous Machine (VSM) and Synchronverter (SynC), for converter-interfaced generators in the real-time environment (Typhoon HIL) to emulate synchronous generator (SG) behaviour. The advantages of grid-forming converter control to provide inertia response service and make the system more robust to changes in the active power of loads have been demonstrated in real-time simulations through a scenario of a positive load step connected to the converter