Pablo Pavón-Domínguez

Universidad de Cádiz | UCA · Department of Mechanical Engineering and Industrial Design

Due to COVID-19 pandemic, the lockdown effects on air pollution level are undeniable. Several studies around the world have detected an uneven behaviour in tropospheric ozone (O3) concentrations. In this work, Seville (Spain) is used as example of faced to traffic place in which the nitrogen dioxide (NO2) is drastically reduced (41%) while O3 has n...

Temporal evolution of the (multi-)fractality in the Madrid Metro subway (Spain) is explored by using it as a study case of a public transport network (PTN). By considering this subway as a graph network, a box-covering method for multifractal analysis of complex networks is employed for assessing the evolution of multifractal parameters along time...

Complex networks have been studied in recent years due to their relevance in biological, social and technical real systems, such as the world wide web, social networks and biochemical interactions. One of the most current features of complex networks is the presence of (multi-)fractal properties. In spite of the amount of contributions that have be...

Spain is a highly decentralized country composed of 17 autonomous communities (regional political and administrative territories), where the power is divided between the central government and a limited self-government of the communities. In the case of the road network, the competences are not completely delegated but the management and planning o...

Multi-fractal detrended fluctuation analysis (MF-DFA) describes long-range correlations across scales in time series in terms of the linear fittings of the fluctuation functions \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upg...

In response to increased desertification in Africa due to climate change, understanding the behavior of particulate matter with aerodynamic diameters less than or equal to 2.5 and 10 μm (PM2.5 and PM10) in the Caribbean is crucial. Fine particles originating from the African dust belt significantly impact the health of the Caribbean population. This...

Formal or perceived obsolescence occurs when a user decides to stop using a product despite its proper functioning. This is because the design of the product is considered obsolete, generating a negative connotation. Such constant changes in the product to adapt to the latest technologies are responsible for this situation. The aim of this study is...

Nowadays, fractal geometry is suitable for characterizing complex geometric shapes such as porous microstructures. For this purpose, the main objective of this work is to analyze images of the porous microstructures of a Lanthanum Strontium Manganite (LSM) electrode, belonging to a fuel cell, in order to describe its complex geometry. For this, it...

Uncertain systems are those wherein some variability is observed, meaning that different observations of the system will produce different measurements. Studying such systems demands the use of statistical methods over multiple measurements, which allows overcoming the uncertainty, based on the premise that a single measurement is not representativ...

Additive Manufacturing (AM) has been one of the technologies that has been booming in recent years. Its main advantages are the versatility in the manufacture of parts, the ability to print limited series and its low acquisition cost, among others. Among these technologies, one of the most widely used by engineering and product design teams is Fuse...

Fractal and multifractal analysis of porous images allow the description of porous media through a scale-invariant understanding. There have been numerous works that have used these analysis techniques for the description of a great variety of real porous media. However, these studies are usually comparative, being difficult to discern the role pla...

Currently, no dimensioning method uses the potential of 3D modelling in CAD systems for representing and defining parts. 3D modelling is a set of sequential steps that can be reproduced when the order, geometries and dimensions of the part are known (summarized in the so-called feature manager tree). Modelling CAD software is based on two-dimension...

Formal or perceived obsolescence describes the fact that users decide to stop using a product, even though it still fulfils its function. This is because the design is perceived as obsolete, which also leads to negative product semantics. This is often the case with products that are frequently updated to incorporate the latest technology. The aim...

The study of multifractal properties is one of the current scopes in the analysis of complex networks. Last decade, several multifractal algorithms have been proposed, both adding new approaches and improving their accuracy or time consumption. One of the methods that provide more advantages is the sandbox method, which does not require to solve th...

In the creation of new products, the conceptual design is the key to generating valid and competitive ideas. In this paper, which applies Virtual Reality (VR) to the generation of new concepts, it is explored the generation of previous ideas through the modelling of virtual sketches. For this purpose, Gravity Sketch software has been used as a tool...

In this work, the complex geometry of beams obtained from topology optimization is characterized through the fractal dimension (FD). The fractal dimension is employed as an efficiency measure of the mass distribution in the beams, that is, the capacity of the optimized solutions to be efficiently distributed in the design space. Furthermore, the po...

Society is increasingly demanding products with a higher degree of customization and shorter manufacturing phases. This demand is currently conditioned by a context of reduced mobility due to Covid-19. For these reasons, a new methodology called Design Learning is proposed, capable of designing personalized toys autonomously to improve the physical...

In this work, the multifractal properties of wind speed and solar radiation are studied in a small region in which a wide variety of micro-climates are concentrated. To achieve this, two years of hourly data are analyzed in Guadeloupe archipelago. The four selected stations for wind speed were chosen according to trade winds direction, while solar...

In literature, many studies have highlighted the health impact of African dust. To our knowledge, few of them have analyzed the impact of mineral dust on the climate of the Caribbean basin in a multifractal way. In this study, the joint multifractal analysis was performed for three variables coexisting in the same geometric support in order to outl...

Previous works have analysed the relationship existing between reference evapotranspiration (ET0) and other climatic variables under a one-at-a-time perturbation condition. However, due to the physical relationships between these climatic variables is advisable to study their joint influence on ET0. The box-counting joint multifractal algorithm des...

This paper sets out to describe the design, construction and testing of a thermoelectric-based conditioned mattress intended to reduce the human-mattress interface temperature, in order to increase the user's sleep quality and thermal comfort in warm locations of Spain. A prototype is constructed and tested, which includes a mattress and a thermoel...

Una de las competencias específicas de la asignatura de Dibujo Técnico en primero de los grados de ingeniería hace referencia al desarrollo de la capacidad de visión espacial. En este sentido, la comprensión del Sistema Diédrico por parte del alumno permite el desarrollo de la misma y proporciona las bases para una inmersión más sencilla en otros á...

Este trabajo tiene como objetivo calcular de forma detallada los caudales de ventilación e infiltración y analizar su influencia sobre la demanda energética de edificios con uso residencial en España. Actualmente el Código Técnico de la Edificación (CTE) es la normativa española que regula los criterios de diseño, cálculo y la ejecución de las inst...

The joint partition function approach to multi-fractal analysis (Meneveau et al., Phys Rev A 41:894–913, 1990) has been widely employed in order to characterize scale relationships between two variables coexisting along a single geometric support. The main contribution of this study was conducting a multifractal analysis for three variables coexist...

A geographic information system (GIS) is presented in this work with the aim of helping the application of problem-based learning process to show the students how to adopt the appropriate decisions for the adaptation of architectural barriers to ensure the universal accessibility in public buildings. The GIS developed here consists of three layers...

This paper seeks to enhance understanding of the data distribution of ground-level ozone time series by analysing their multifractal spectra. Emphasis is placed on the suitability of the box-counting and moments methods for characterizing scaling properties of ozone concentration, enabling us to describe similarities and differences inferred from t...

Ground-level ozone is an atmospheric pollutant which is formed as a result of several photochemical reactions in cities and surrounding areas. In recent years, it has gained prominence over other types of emissions, mainly due to the damage caused to human health and crops, its transport from emission areas to surroundings and the difficulty in pre...

Ozone is a highly unpredictable pollutant which severely affects living conditions in urban and surrounding areas in the Mediterranean basin. This secondary pollutant periodically reaches extremely high concentrations, damaging human health. Multiple linear regression has been widely used in previous works due to the fact that it is a simple and ve...

Land surface air temperature (SAT), registered at 1.25–2 m above the ground, is influenced by wind patterns. As a consequence, some phenomena such as urban heat islands and the formation of ground-level air pollutants are affected. Detailed understanding of the effects of wind circulations on SAT is convenient to improve the knowledge of these phen...

The time series corresponding to variables related with the climate have been frequently studied by using the descriptive statistics. However, as several works have suggested, other approaches such as the multifractal analysis can be taken into account to complete the information about some climatic and environmental phenomena obtained from the sta...

High concentrations of ground-level ozone have a negative impact on human health and the environment. Detailed knowledge on the effects of nitrogen dioxide on the ozone seasonal pattern is convenient to prevent these undesirable effects. Thus, the joint multifractal approach has been used to complete the information provided by descriptive statisti...

High concentrations of ground-level ozone have a negative impact on human health and the environment, especially in urban places. Detailed knowledge on the effects of nitrogen dioxide on the ozone seasonal pattern is convenient to prevent these undesirable effects. Thus, the joint multifractal approach has been used to complete the information prov...