Jesus Antonio Del Río

Universidad Nacional Autónoma de México | UNAM · Instituto de Energias Renovables

This work presents an economic analysis that illustrates the feasibility and the possible benefits related to the replacement of internal combustion vehicles (ICVs)by electric vehicles (EVs) public transportation in medium-sized cities. According to the current operating conditions, we calculate the cost of operating internal combustion vehicles an...

Photonic devices require precise and high-cost procedures to evaluate their performance which is related to their temperature increase. The fundamental understanding of thermal phenomena, ergo measurement of temperature, inside radiation controlling devices is of great relevance to study their performance. In this paper, we carry out a comprehensiv...

In quantum mechanics courses, the concept of a reference frame is frequently hidden. In this article, we present a basic perspective to introduce the transformations of a reference frame based on unitary transformations. These unitary transformations are inspired in canonical transformation for reference frame from the perspective of classical mec...

Solar drying is a sustainable process that may impact the quality of dried food. This is because, pigments contained in food are sensitive to sunlight, and exposure to ultraviolet radiation can affect them. We applied biopolymer-based coatings on strawberry, from hydro-colloidal solutions of Opuntia ficus indica-mucilage, fenugreek, xanthan gum, gu...

The design, construction, and ray simulation of a new compound parabolic concentrator based on a toroidal shape (toroidal compound parabolic concentrator, TCPC) are addressed. Such analysis indicates that the amount of concentrated radiation is independent of the Sun trajectory. Thus, the TCPC has the advantage of concentrating Sun rays in a spot,...

El cambio climático es una amenaza que atenta contra la paz, la humanidad y la misma existencia de los seres vivos sobre este planeta. Sin embargo, existen acciones que como sociedades podemos hacer para combatir y contrarrestar los efectos del calentamiento global. Con la Reforma energética, México comenzó a dar sus primeros pasos para bajar las e...

Solar drying is a sustainable process, that may impact the quality of dried food. This is because, pigments contained in food are sensitive to sunlight, and exposure to ultraviolet radiation can affect them. We applied biopolymer-based coatings on strawberry, from hydro-colloidal solutions of nopal-mucilage, fenugreek, xanthan gum, gum Arabic, and...

The development of the scientific output of Mexico in Applied Physics is explored from 1973 to 2017 in the Web of Science using traditional bibliometric indicators such as prolific authors and institutions; collaborating countries; journal preferences. A total of 9078 documents in the subject category of Applied Physics were retrieved and analyzed...

Under lab and real sky conditions, a novel solar lighting system formed by a Toroidal Parabolic Concentrator and optical fibers is studied. The full system performance and characteristics were obtained.

Nowadays, methodologies coming from studying physical systems are being applied to the description of a wide variety of complex systems. In particular, one can study thermodynamical methods to describe the overall behavior of many systems, independent of the precise microscopic construction. In this paper, a real Mexican highway is studied as a cel...

Visualization of complex flows is one of the most challenging problems in fluid dynamics. In this paper, we analyze experimentally the free surface swirling flow of a shallow layer of a weak electrolyte driven electromagnetically in a cylindrical container using a thermographic camera. The flow is produced by a force created by the interaction of a...

Policy-makers require strategies to select a set of sustainability indicators that are useful for monitoring sustainability. For this reason, we have developed a model where sustainability indicators compete for the attention of society. This model has shown to have steady situations where a set of sustainability indicators are stable. To understan...

Appendix A. Fig A. Appendix B. Table A. Table B. Table C. Fig B. Appendix C. Table D. Table E. Table F. Table G. Table H. Table I. Table J. Table K. Table L. Table M. Table N. Table O. Appendix D. (PDF)

Photonic crystals have been an object of interest because of their properties to inhibit certain wavelengths and allow the transmission of others. Using these properties, we designed a photonic structure known as photodyne formed by two porous silicon one-dimensional photonic crystals with an air defect between them. When the photodyne is illuminat...

Efficient and optimal energy transport is one of the present challenges in the physics of many different devices. In this context, the dynamic effective thermal diffusivity of a fluid with a non-Fourier heat conduction law is examined. Considering the simplest description for heat conduction beyond Fourier's law (the Cattaneo-Vernotte equation), an...

Photonic crystals (PCs) are built to control the propagation of light within their structure. These can be used for an assortment of applications where custom designed devices are of interest. Among them, one-dimensional PCs can be produced to achieve the reflection of specific and broad wavelength ranges. However, their design and fabrication are...

There are two main physical properties needed to fabricate 1D photonic structures and form perfect photonic bandgaps: the quality of the thickness periodicity and the refractive index of their components. Porous silicon (PS) is a nano-structured material widely used to prepare 1D photonic crystals due to the ease of tuning its porosity and its refr...

In this study the laws of mechanics for multi-component systems are used to develop a theory for the diffusion of ions in the presence of an electrostatic field. The analysis begins with the governing equation for the species velocity and it leads to the governing equation for the species diffusion velocity. Simplification of this latter result pro...

We induced mechanical self-oscillations in a microcavity structure made of porous silicon one- dimensional photonic crystals (PSi-1DPC) with an air gap. The electromagnetic force generated within the whole photonic structure, by light with a wavelength of 633 nm, is enough to overcome energy losses and sustain self- oscillations. From these mechano...

Current research on porous silicon includes the construction of complex structures with luminescent and/or photonic properties. However, their preparation with both characteristics is still challenging. Recently, our group reported a possible method to achieve that by adding an oxidant mixture to the electrolyte used to produce porous silicon. This...

Wind turbine for low power applications is a clean energy alternative to contribute global warming mitigation. The correct description of wind speeds is crucial to determine the economic viability of a wind power project. The sampling technique used in resource assessment is supported by van der Hoven's work, which concludes that minimum dispersion...

We induced mechanical self-oscillations in a microcavity structure made of porous silicon onedimensional photonic crystals (PSi-1DPC) with an air gap. The electromagnetic force generated within the whole photonic structure, by light with a wavelength of 633 nm, is enough to overcome energy losses and sustain selfoscillations. From these mechano-opt...

High reflective mirrors are commonly used in solar concentration devices. It has been shown that photonic mirrors are suitable for this purpose. However, despite their high reflectivity, they absorb radiation and heat up showing degradation. To overcome this problem here we propose to enhance the reflectivity of the mirrors. We report an improved a...

This paper describes a mathematical method for estimating static formation temperatures using a func-tion based on extrapolation of the measured data in the thermal recovery process of geothermal andpetroleum wells. This method uses the least squares fit of a rational polynomial model to describe thetransient temperature data and also provides an a...

Nowadays the challenge for humanity is to find pathways towards sustainable development. Decision makers require a set of sustainability indicators to know if the sustainability strategies are following those pathways. There are more than one hundred sustainability indicators but they differ on their relative importance according to the size of the...

Estimating the power output is one of the elements that determine the techno-economic feasibility of a renewable project. At present, there is a need to develop reliable methods that achieve this goal, thereby contributing to wind power penetration. In this study, we propose a method for wind power error estimation based on the wind speed measureme...

In this paper we present an analysis of all the research papers published on journals registered in the Web of Science, with the phrase “solar energy” in its title, abstract or keywords that have at least one author with address in Ibero-America. We present the results of citation mining applied to all such records published between 2002 and 2012....

The use of secondary mirrors in solar energy concentration is common. However, high concentrated solar radiation heats these mirrors thereby degrading their physical properties. In particular, aluminum mirrors melt because of high temperature due to storage by high radia-tive heat transfer. In contradistinction photonic crystals could present ''per...

Optical tweezers is an example how to use light to generate a physical force. They have been used to levitate viruses, bacteria, cells, and sub cellular organisms. Nonetheless it would be beneficial to use such force to develop a new kind of applications. However the radiation pressure usually is small to think in moving larger objects. Currently,...

We studied theoretically and experimentally the induction of electromagnetic forces in one-dimensional photonic crystals with localized defects when light impinges transversally to the defect layer. The theoretical calculations indicate that the electromagnetic forces increases at a certain frequency that coincide with a defect photonic state. The...

The morphology of porous silicon (p-Si) depends on several parameters such as the doping type and the carriers’ concentration of the crystalline silicon substrate. The electrolytes used in the p-Si fabrication also have an important role. The final structure determines if p-Si is luminescent or suitable for photonic applications. Experimental resul...

Due the different possibilities for fit the Probability Density Functions adjustable to a wind speed data set, a best fit selection criterion is developed based on slope, intercept values and standard errors of Ordinary Linear Regression model calculated from the probabilistic model and experimental data. Uncertainty associated with measuring instr...

In this paper, we undertake the thermodynamical analysis of the diffusive transport to wave propagation transition in heat conducting thin films. Several constitutive equations have been conceived to describe heat transport but most fail at the nanometric length scales, where size effects must be taken into account or at time scales in the order of...

The current demand for housing in developing countries has led to the construction of low-cost housing designed in any climate without regional adaptation, which usually causes low comfort levels and high energy consumptions. Indoor thermal variables have been measured and field surveys have been applied to occupants of low-cost housing in hot dry...

Porous silicon (p−Si)(p−Si) morphology depends on several parameters of the crystalline silicon substrate such as doping type and carriers concentration. Experimental results on (p−Si)(p−Si) show that although in the porous samples carriers are greatly reduced, boron atoms remain in the bulk. The study of p-type silicon crystals substrates by means...

In this paper we report the detailed fabrication and experimental characterization of porous silicon one-dimensional photonic bandgap structures for specific photonic applications. These structures have been prepared on silicon substrate as well as free standing and can be proven useful for a large variety of applications such as high quality diele...

La actual demanda de vivienda en países en vías de desarrollo, ha propiciado la construcción de casas económicas con diseño inadecuado para las condiciones climáticas regionales, lo cual provoca que sean poco confortables, además de que consumen mucha energía. En este trabajo se analizan datos de encuestas y mediciones para obtener el grado de habi...

Most of the thermodynamic analysis of ovens are focused on efficiency, but they need to behaves under real-life conditions, then the effectiveness of the ovens plays a crucial role in their design. In this paper we present a thermodynamical model able to describe the temperature evolution in ovens, furnaces or kilns to harden, burn or dry different...

The use of porous silicon (PS) in fabricating optoelectronic devices is in progress. However, the performance of such applications still needs to be improved. In particular, in solar cells heat must be dissipated to avoid a decay in their efficiency and one of the properties of PS that must be evaluated is the effective thermal conductivity. It is...

Porous silicon is an efficient photo- and electro-luminescence material and represents a promising candidate for opto-electronic applications. In the last years, porous silicon multilayers with a high enough refractive index contrast have been obtained. In this work, we study the light transmission in Fibonacci multilayers made of porous silicon. T...

A formalism of extended irreversible thermodynamics (EIT) is used to study the physical aspects of heat, momentum and mass transport through porous media. The thermodynamic space is enlarged with respect to that of classical linear irreversible thermodynamics (LIT) to include the mass, heat and momentum fluxes as independent variables. The time evo...

Chemically deposited thin films have multiple applications, in particular for low cost solar cells production. However, due to their inhomogeneous structure, it is very difficult to predict their physical properties. In this work we present a mean field approximation to model the effective electrical conductivity of the polycrystalline ZnO chemical...

In previous works we have obtained an expression for the effective electrical conductivity of a columnar model simulating porous silicon. We used the averaging volume method that has proven to be successful in treating fluid transport in porous media. With this method we can calculate the bulk and the surface contribution to an effective transport...

Far-field secondary emission spectra of one-dimensional periodic photonic structures based on porous silicon show characteristic co-focal rings centered close to the structure plane normal. The rings appear when the frequency of picosecond excitation laser pulses is tuned to the edges of the fourth photonic band gap. They can be clearly distinguish...

In this work, we show an algorithm to calculate the complex refractive index of porous silicon (PS) on its crystalline silicon (c-Si) substrate in UV-NIR range by means of the reflectance spectra only. The algorithm is based on the analytical relations established by Heavens to obtain both complex refractive index and thickness of an absorbing thin...

We consider a simple model to give a plausible mechanical explanation of what are the actual resting heart rates of mammals optimized for. We study what is the optimal frequency for a viscoelastic fluid circulating in a pulsatile way through a network of tubes and conclude that the heart rate is not optimized to transport blood through the whole ne...

In solar energy technologies the compound parabolic concentrator (CPC) is one of the most used devices due to its high concentration. Although this device can be used to illustrate optical and geometrical principles, a detailed demonstration of its properties has not been presented in the open literature. In this paper, we present a geometrical and...

The work by U.H. Kurzweg for the enhanced longitudinal heat transfer of a Newtonian fluid in zero-mean oscillatory laminar flows in tubes subjected to an axial temperature gradient [U.H. Kurzweg, J. Heat Transfer 107 (1985) 459–462] is generalized for the case of a viscoelastic Maxwell fluid. While Kurzweg discovered that a Newtonian fluid exhibits...

In this paper we present a novel solar concentrating application, a coffee brewing system using a satellite TV mini-Dish concentrator coupled to a stovetop espresso coffee maker. We present a theoretical model for the thermal behavior of the water in the lower chamber of the coffee maker. We validate the model obtaining good agreement with the expe...

In this paper we report the viability of using porous silicon photonic mirrors (PSPM) as secondary reflectors in solar concentration systems. The PSPM were fabricated with nanostructured porous silicon to reflect light from the visible range to the near infrared region (500–2500 nm), although this range could be tuned for specific wavelength applic...

Two of the most important properties of a porous silicon multilayer for photonic applications are flat interfaces and a relative large refractive index contrast between layers in the optical wavelength range. In this work, we studied the effect of the current density and HF electrolyte concentration on the refractive index of porous silicon. With t...

The purpose of this document is to analyze the current situation of the inventions created within public universities and research centers, taking a close view of the patent domestic system. As example, it describes the research and development system of Morelos. It discusses some of the obstacles faced by public universities and research centers w...

In this paper we study the propagation of light through an asymmetric array of dielectric multilayers built by joining two porous silicon substructures in a Fibonacci sequence. Each Fibonacci substructure follows the well-known recursive rule but in the second substructure dielectric layers A and B are exchanged. Even without mirror symmetry, this...

We simulate a lossless one-dimensional photonic crystals (1DPC) structure and show that negative refraction could be present near the low frequency edge of at least the second, fourth and sixth bandgaps. We experimentally demonstrate for the first time negative refraction in strongly modulated porous silicon 1D-PC in the visible and near infrared r...

This study proposed and experimentally demonstrated a cost-efficient scheme that can deliver 60 GHz millimeter-wave (mm-wave) multi-gigabit wireless services over 125 km long-reach passive optical networks (PONs) without any dispersion compensation. By introducing a remote local exchange (LE) stage with robust signal regeneration and all-optical up...

In this paper we focused on developing a methodology to promote innovation through industry-university collaboration. So we analyzed two different scenarios. On one hand we have the traditional firm, that is striving to survive in the global knowledge-driven economic framework and on the other we have world class research universities that are tryi...

LA CIENCIA EN LATINOAMÉRICA HA BUSCADO TENER UN PAPEL CADA VEZ MAS RELEVANTE EN EL AMBIENTE CIENTÍFICO MUNDIAL. UNO DE LOS ESFUERZOS SE DIRIGE A LA EDICIÓN DE RE VISTAS CIENTÍFICAS QUE LOGREN UN NIVEL DE CALIDAD RE CONOCIDO MUNDIALMENTE Y QUE RESPONDAN A LOS INTERESES DE LAS COMUNIDADES LATINOAMERICANAS. LA JUSTIFICACIÓN A LA EXISTENCIA DE DICHAS R...

In this paper, a novel design of a solar oven for the intertropical zones is presented. The oven box has seven faces instead of the six faces of most common designs reported in the literature, two of them are alternatively used as bases. This oven has four fixed mirrors to concentrate solar energy.The main advantage of this novel design is that the...

Emission signal from fluorescent molecules (fluorescein-5-maleimide) in a porous silicon mirror is enhanced by tuning the pore size and reflectance spectrum of the porous silicon multilayer structure. This is achieved when the reflectance spectrum of the silicon mirror overlaps the fluorescent excitation and emission wavelengths of the fluorescent...

Porous silicon (PSi) nanostructures have remarkable optical properties that can be used for biosensing applications. In this paper we report first on the fabrication of heavily doped p-type PSi with pore diameters in the range of 400-4000 nm. The nonspecific and specific binding of the Glucose Oxidase protein (GOX) was then studied onto the PSi mir...

The dynamics of a fluid in a vertical tube, subjected to an oscillatory pressure gradient, is studied experimentally for both a Newtonian and a viscoelastic shear-thinning fluid. Particle image velocimetry is used to determine the two-dimensional velocity fields in the vertical plane of the tube axis, in a range of driving amplitudes from 0.8 to 2....

Dado que la visibilidad internacional de la investigación científica es de especial importancia para los países en desarrollo, fueron analizados los trabajos publicados entre 1973 y 2005 por los tres países más productivos de Latinoamérica, Argentina, Brasil y México, en las revistas multidisciplinarias Nature y Science, comparándolos con los de Es...

In this work, we propose the use of oscillatory laminar flows to enhance the transfer of heat from solar collectors. The idea is to explore the possibility of transferring the heat collected from a solar device to a storage tank by means of a zero-mean oscillating fluid contained in a tube. This method takes advantage of the fact that the effective...

DOI:https://doi.org/10.1103/PhysRevE.73.049902

In this paper we report the detailed fabrication and experimental characterization of porous silicon one-dimensional photonic bandgap structures for specific photonic applications. These structures have been prepared on silicon substrate as well as free standing and can be proven useful for a large variety of applications such as high quality diele...

This chapter explains the variational formulations of irreversible hyperbolic transport. It illustrates the restricted variational principles as they are applied to extended irreversible thermodynamics for the cases of the soil-water system and heat transport in solids. This kind of restricted variational principles leads to the time-evolution equa...

We study theoretically the optical losses in a microcavity made of porous silicon. A quantum derivation of the shape of the resonant transmittance peak for the general case is presented and then we analyze the effect of Rayleigh scattering of light on the disordered structure of porous silicon in details. We introduce a simple model of porous silic...

One century ago Albert Einstein published one of his most famous papers as a result of his doctoral dissertation about the Brownian motion. With this paper he opened a new view of the complex systems, he opened the use of statistical physics tools for describing many particles systems. Scientometrics is a branch of the sciences dealing with the stu...

Citation Mining is an integration of citation bibliometrics and text mining. It can be used to measure the impact, both direct and indirect, of scientific and technological research. In this work we present a Simple Web Interface for a set of command line oriented programs for Citation Mining. The separation of the Web Application and the Program A...