Papers by Jesus Antonio del Rio
International Journal of Modern Physics B, 2006
In this paper we report the detailed fabrication and experimental characterization of porous sili... more 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 dielectric mirrors and filters.
Revista Mexicana de Física, 1988
... Acknowledgements \Ve are pleased to acknowledge the critical reading of the manuscript by Dr.... more ... Acknowledgements \Ve are pleased to acknowledge the critical reading of the manuscript by Dr. Ramón reralta-Fabi. Page 8. 114 M. Moreno and JA del Rlo References 1. H. Goldstein, Classical Mechanics, Addison-Wesley Publishing Ca., lnc., Reading, Mass., USA, pp. 378. ...
Palapa, Jul 31, 2013
Los edificios interactuan permanentemente con el medio exterior, intercambiando flujos energetico... more Los edificios interactuan permanentemente con el medio exterior, intercambiando flujos energeticos. Las variables del entorno que los afectan y provocan determinados ambientes interiores cambian constantemente con el tiempo. El edificio, por lo tanto, debera ser capaz de adaptarse permanentemente a las variaciones a fin de mantener el ambiente interior deseado. Es decir, que para disenar un edificio que pueda controlar adecuadamente los efectos de los cambios, debera conocerse como se producen. En este trabajo se muestran metodologias para analizar el comportamiento energetico de los edificios, diferenciando las escalas de tiempo en las que se produce diferente tipo de fenomenos, con el fin de formular criterios de diseno acordes con dichas escalas. Se presentan tambien ejemplos de casos para el analisis del comportamiento termico y el luminico. La arquitectura no puede ser estatica, sino que su funcionamiento ha de cambiar constantemente, tal como cambian las variables ambientales, para ser capaz, en todo momento, de controlar los flujos energeticos, entrantes y salientes, que intercambia con el medio exterior. Para esto, los criterios de diseno deben incorporar necesariamente el factor tiempo y manejar las escalas de tiempo de los diferentes tipos de variables.
ACE: Architecture, City and Environment, 2012
La actual demanda de vivienda en países en vías de desarrollo, ha propiciado la construcción de c... more 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 habitabilidad de viviendas económicas en clima cálido seco. Para evaluarlo, se calcula la temperatura de neutralidad, y el rango de confort para la población que está adaptada al clima local. En el presente estudio se propone un modelo para predecir las sensaciones térmicas de personas aclimatadas a condiciones similares a las del estudio, en función de la temperatura y la humedad relativa. El modelo tiene una buena concordancia estadística con las encuestas de habitabilidad presentadas. Conocer las condiciones específicas de confort térmico para cada clima y tipo de población, favorece el diseño de edificaciones más habitables. Expresar estas...
Scientific Reports, 2021
Solar drying is a sustainable process that may impact the quality of dried food. This is because,... more 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, gum Arabic, and guar gum to evaluate their potential use as UV filters for solar drying of food. Thermal properties and the optical transmittance, absorbance and reflectance of the coatings were measured to assess their influence on food-sunlight interaction. During the drying experiments, the moisture content, total anthocyanins (TA), and total phenolic compounds (TPC) were measured. Optical and thermal properties are influenced by the biopolymer-based coatings. Also, the optical properties are influenced by the coating thickness. The differences in optical and thermal properties influence the drying process. Differences exist in the drying...
Scientific reports, Nov 4, 2016
In this study the laws of mechanics for multi-component systems are used to develop a theory for ... more 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 provides a momentum equation containing three dominant forces: (a) the gradient of the partial pressure, (b) the electrostatic force, and (c) the diffusive drag force that is a central feature of the Maxwell-Stefan equations. For ideal gas mixtures we derive the classic Nernst-Planck equation. For liquid-phase diffusion we encounter a situation in which the Nernst-Planck contribution to diffusion differs by several orders of magnitude from that obtained for ideal gases.
Scientific reports, Jan 21, 2016
Current research on porous silicon includes the construction of complex structures with luminesce... more 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 mixture can chemically modify their microstructure by changing the thickness and surface passivation of the pore walls. In this work, we prepared a series of samples (with and without oxidant mixture) and we evaluated the structural differences through their scanning electron micrographs and their optical properties determined by spectroscopic ellipsometry. The results showed that ellipsometry is sensitive to slight variations in the porous silicon structure, caused by changes in their preparation. The fitting process, based on models constructed from the features observed in the micrographs, allowed us to see that the mayor effect of the...
PloS one, 2015
Nowadays the challenge for humanity is to find pathways towards sustainable development. Decision... more 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 locality and change on time. The resources needed to follow these sustainability indicators are scarce and in some instances finite, especially in smaller regions. Therefore strategies to select set of these indicators are useful for decision makers responsible for monitoring sustainability. In this paper we propose a model for the identification and selection of a set of sustainability indicators that adequately represents human systems. In developing this model, we applied evolutionary dynamics in a space where sustainability indicators are fundamental entities interconnected by an interaction matrix. we used a fixed interaction that si...
PloS one, 2015
Estimating the power output is one of the elements that determine the techno-economic feasibility... more 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 measurement error, probability density function, and wind turbine power curves. This method uses the actual wind speed data without prior statistical treatment based on 28 wind turbine power curves, which were fitted by Lagrange's method, to calculate the estimate wind power output and the corresponding error propagation. We found that wind speed percentage errors of 10% were propagated into the power output estimates, thereby yielding an error of 5%. The proposed error propagation complements the traditional power resource assessments. The wind power estimation error also allows us to estimate intervals for the power production leveled cost or...
Journal of the American Society for Mass Spectrometry, 2004
Identifying research users, applications, and impact is important for research performers, manage... more Identifying research users, applications, and impact is important for research performers, managers, evaluators, and sponsors. Identification of the user audience and the research impact is complex and time consuming due to the many indirect pathways through which fundamental research can impact applications. This paper identified the literature pathways through which two highly-cited papers of 2002 Chemistry Nobel Laureates Fenn and Tanaka impacted research, technology development, and applications. Citation Mining, an integration of citation bibliometrics and text mining, was applied to the Ͼ1600 first generation Science Citation Index (SCI) citing papers to Fenn's 1989 Science paper on Electrospray Ionization for Mass Spectrometry, and to the Ͼ400 first generation SCI citing papers to Tanaka's 1988 Rapid Communications in Mass Spectrometry paper on Laser Ionization Time-of-Flight Mass Spectrometry. Bibliometrics was performed on the citing papers to profile the user characteristics. Text mining was performed on the citing papers to identify the technical areas impacted by the research, and the relationships among these technical areas.
Scientific reports, Jan 19, 2018
Photonic crystals (PCs) are built to control the propagation of light within their structure. The... more 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 challenging due to the diversity of periodic arrangement and layer configuration that each different PC needs. In this study, we present a framework to design high reflecting PCs for any desired wavelength range. Our method combines three stochastic optimization algorithms (Random Search, Particle Swarm Optimization and Simulated Annealing) along with a reduced space-search methodology to obtain a custom and optimized PC configuration. The optimization procedure is evaluated through theoretical reflectance spectra calculated by using the Equispaced Thickness Method, which improves the simulations due to the consideration of incoherent ligh...
Scientific Reports, 2021
Solar drying is a sustainable process that may impact the quality of dried food. This is because,... more 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, gum Arabic, and guar gum to evaluate their potential use as UV filters for solar drying of food. Thermal properties and the optical transmittance, absorbance and reflectance of the coatings were measured to assess their influence on food-sunlight interaction. During the drying experiments, the moisture content, total anthocyanins (TA), and total phenolic compounds (TPC) were measured. Optical and thermal properties are influenced by the biopolymerbased coatings. Also, the optical properties are influenced by the coating thickness. The differences in optical and thermal properties influence the drying process. Differences exist in the drying rate for strawberry slices with coating, compared with those without the coatings. In general, the TA and TPC content in the product are better preserved under solar drying than in control experiments done in a drying oven. A partial transmittance of solar UV radiation is recommended to obtain increased TA and TPC contents in the dried product.
Scientific Reorts, 2016
In this study the laws of mechanics for multi-component systems are used to develop a theory for ... more 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 provides a momentum equation containing three dominant forces: (a) the gradient of the partial pressure, (b) the electrostatic force, and (c) the diffusive drag force that is a central feature of the Maxwell-Stefan equations. For ideal gas mixtures we derive the classic Nernst-Planck equation. For liquid-phase diffusion we encounter a situation in which the Nernst-Planck contribution to diffusion differs by several orders of magnitude from that obtained for ideal gases. The study of ion transport in fluids is an important topic with a wide range of applications. Some classic examples are batteries, fuel cells, electroplating, and protection of metal structures against corrosion 1. In addition to the traditional battery, the flow battery or rechargeable fuel cell 2,3 represents an important new technology involving the transport of ions. Ion exchange membranes have a wide range of applications 4 , and the underlying theory has been a matter of concern for several decades 5. Other examples of complex electro-chemical systems are the transport of charged particles in ion channels 6-8 , in protein channels 9 , and during the primordial conversion of light to metabolic energy 10. Often upscaling is necessary for a complete analysis of the transport of electrolytes in charged pores 11,12 .
Scientific Reports, 2014
Optical tweezers is an example how to use light to generate a physical force. They have been used... more 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, there is some research investigating novel photonic working principles to generate a higher force. Here, we studied theoretically and experimentally the induction of electromagnetic forces in one-dimensional photonic crystals when light impinges on the off-axis direction. The photonic structure consists of a micro-cavity like structure formed of two one-dimensional photonic crystals made of free-standing porous silicon, separated by a variable air gap and the working wavelength is 633 nm. We show experimental evidence of this force when the photonic structure is capable of making auto-oscillations and forced-oscillations. We measured peak displacements and velocities ranging from 2 up to 35 microns and 0.4 up to 2.1 mm/s with a power of 13 mW. Recent evidence showed that giant resonant light forces could induce average velocity values of 0.45 mm/s in microspheres embedded in water with 43 mW light power. T he concept of radiation pressure has been used in the past for manipulating micro-objects 1 and biological organisms 2. The fast development of electromagnetic wave driven micro motors has motivated several research groups to investigate novel working principles for such micro motors 3 , but there is a main obstacle, normally the radiation pressure is too small for this kind of applications 4. Nonetheless some resonance principles can be used to increase the force significantly. For instance, a waveguide made of lossless dielectric blocks, where the direction of the force exerted on the dielectric is parallel to the waveguide axis 5,6. A second approach is a Bragg waveguide, based on a Fabry-Perot cavity in which the peak of the force only appears at the structures' resonant frequencies and the force is normal to the waveguide wall 7. However in this design the force tends to separate the two mirrors that form the Fabry-Perot cavity, having as a consequence a dramatic reduction of the force 4. A third approach can use a one-dimensional photonic crystal with structural defects, where a localized mode results in strong electromagnetic fields around the position of the defect. Thus, the strong fields enhance the tangential and normal force on a lossy dielectric layer 4. Recently 8 a resonant light pressure effect has been used to prove the existence of strong peaks of the optical forces by studying the optical propulsion of dielectric microspheres along tapered fibers. They observed giant optical propelling velocities for submerged polystyrene microspheres. Such velocities exceed previous observations by more than one order of magnitude. This work is organized as follows: in the first section we present the experimental details to fabricate the photonic structure and how to measure the auto and forced oscillations. Secondly, we describe briefly the theory to induce an electromagnetic force in the photonic structure. We present a dynamical model that can be used to describe either auto or forced oscillations of the photonic structure and we compare the experimental results with the model. Finally, we wrap-up the work by giving some conclusions. Results and discussion Details of the experimental setup for the oscillation measurements can be seen in figure 1 and its full description can be found in methods. Sample fabrication information is also found in methods and references 9, 10. Figure 2a shows a cartoon of both foils overlapped over the glass substrate to create the photonic oscillator and figure 2b shows the scheme of the bifoil structure used for theoretical calculations. Now, consider the structure depicted on figure 2b. Let us assume that light impinges on the off-axis direction at angle h 0 with the electric field polarized in the y-direction (TE polarization) and magnitude:
Scientifi Reports, 2016
Current research on porous silicon includes the construction of complex structures with luminesce... more 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 mixture can chemically modify their microstructure by changing the thickness and surface passivation of the pore walls. In this work, we prepared a series of samples (with and without oxidant mixture) and we evaluated the structural differences through their scanning electron micrographs and their optical properties determined by spectroscopic ellipsometry. The results showed that ellipsometry is sensitive to slight variations in the porous silicon structure, caused by changes in their preparation. The fitting process, based on models constructed from the features observed in the micrographs, allowed us to see that the mayor effect of the oxidant mixture is on samples of high porosity, where the surface oxidation strongly contributes to the skeleton thinning during the electrochemical etching. This suggests the existence of a porosity threshold for the action of the oxidant mixture. These results could have a significant impact on the design of complex porous silicon structures for different optoelectronic applications. Porous silicon (pSi) is a nanostructured material produced by the electrochemical etching of crystalline silicon (c-Si) in a hydrofluoric acid (HF) based solution. When the thickness of its pore walls (skeleton) is of a few nano-meters, pSi shows visible luminescence due to the quantum confinement effect on the charge carries, mainly in samples prepared from high resistivity c-Si substrates 1. Moreover, it is well documented that by alternating the applied electrical current during the fabrication of pSi, it is possible to produce a multilayer structure formed by layers of different porosity (refractive index). One dimensional photonic structures are usually produced from low resistivity c-Si substrates, where a high refractive index contrast between layers can be obtained 2,3. Current research on pSi is concerned with the construction of complex photonic and luminescent structures for different applications, based on the especial correlation between its microstructure and optical properties, that could lead to a tuneable behaviour of light inside these materials 2-6. Recently, our group reported that by adding a polyoxometalate and hydrogen peroxide as an oxidant mixture (OM) to the electrolyte, to control the thickness and surface passivation of the skeleton, it is possible to produce luminescent and photonic properties in a same pSi structure 5. The final properties of each pSi sample depend strongly on the effect of the OM over its growth mechanism, thus a robust characterization is determinant to help in the understanding of such properties. Since the appearance of the first report about pSi, a great amount of characterization techniques, led by electron microscopy 4 , have contributed with valuable results. The observation of phenomena like luminescence, brought the optical techniques like photoluminescence, reflectometry and ellipsometry to play a very important role in determining different properties 4,7,8. Therefore, the analysis of the relationship between the optical and structural properties of pSi, through ellipsometric measurements in the UV-Vis-NIR region of the electromagnetic spectrum, can provide important evidence to study the effect of the addition of the OM in the fabrication of pSi.
Scientific Reports
Photonic crystals (PCs) are built to control the propagation of light within their structure. The... more 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 challenging due to the diversity of periodic arrangement and layer configuration that each different PC needs. In this study, we present a framework to design high reflecting PCs for any desired wavelength range. Our method combines three stochastic optimization algorithms (Random Search, Particle Swarm Optimization and Simulated Annealing) along with a reduced space-search methodology to obtain a custom and optimized PC configuration. The optimization procedure is evaluated through theoretical reflectance spectra calculated by using the Equispaced Thickness Method, which improves the simulations due to the consideration of incoherent light transmission. We prove the viability of our procedure by fabricating different reflecting PCs made of porous silicon and obtain good agreement between experiment and theory using a merit function. With this methodology, diverse reflecting PCs can be designed for any applications and fabricated with different materials. The unique optical features of confining light or controlling the propagation of electromagnetic waves in pho-tonic crystals (PCs) enable many important device applications. Waveguides 1 , Bragg-mirrors 2 , surface plasmonic structures 3 , nanocavities and nano-lasers 4,5 are some examples of optical devices that can be fabricated using PCs. These structures have in common that they are formed of periodically arranged dielectric materials, and their functionality depends highly on the distribution of those materials. Photons entering a PC interact with its periodic dielectric constant and are consequently organized into photonic bands. Analogously to electrons in a crystal, their propagation will be limited by photonic band gaps (PBGs) where transmission states are forbidden. Hence, different designed PCs constrain the propagation of the photons (electromagnetic waves) within the structure depending on their periodic arrangements. The simplest PCs are one-dimensional and are composed of alternating high and low refractive index layers. These structures can be designed to interact with the electromagnetic waves in such a manner that pho-tonic mirrors (also called Bragg-reflectors) are formed, where "perfect" reflection for specific wavelengths can be achieved. Broadband mirrors can also be engineered if the reflection of a broader wavelength range is needed. These broader mirrors can be achieved by overlaying different Bragg reflectors where each one reflects around a specific central wavelength, resulting in a wider PBG. However, choosing the proper central wavelengths and hence the layer configuration for these Bragg reflectors to superpose adequately is no simple task; furthermore designing such reflecting structures may involve complicated and unpractical methods. In the context of this work, previous reports have been focused on the PBG enlargement based on staggered structures 6,7 or chirped gratings 8-10 , amongst others. Commonly, predetermined structure parameters such as layer number, the amount of Bragg reflectors or layer thickness functions constraint to experimental parameters, limit the versatility of these methods. In this paper, we present a practical method to custom design and then evaluate the fabricated broadband PC mirrors. This procedure can be applied to different dielectric materials and easily modified to design other PC structures such as filters for example.
Cuando hay un recurso común compartido y cada usuario se beneficia directamente de su uso, pero c... more Cuando hay un recurso común compartido y cada usuario se beneficia directamente de su uso, pero comparte los costos de su abuso con todos los demás; la consecuencia es la sobreexplotación del recurso, erosionándose hasta que deja de estar disponible para cualquier persona. Si el mundo fuera infinito no habría que preocuparse, la cantidad de recursos en el planeta sería también infinita y el número de habitantes podría ser ilimitado. Lamentablemente el planeta no es infinito y nuestra forma de usar los recursos naturales ha sido sin contemplar limitaciones.
Journal of Physics D: Applied Physics, 1999
The consequences for magnetic transport of a generalized Ohm's law that includes the inertia ... more The consequences for magnetic transport of a generalized Ohm's law that includes the inertia of electrons are explored. For metals, this law coincides with the Drude model for electronic conduction. A formula for the absorption coefficient in a rigid conductor is ...
Physical Review E, 2006
The global entropy generation rate in the zero-mean oscillatory flow of a Maxwell fluid in a pipe... more The global entropy generation rate in the zero-mean oscillatory flow of a Maxwell fluid in a pipe is analyzed with the aim at determining its behavior at resonant flow conditions. This quantity is calculated explicitly using the analytic expression for the velocity field and assuming isothermal conditions. The global entropy generation rate shows well-defined peaks at the resonant frequencies where the flow displays maximum velocities. It was found that resonant frequencies can be considered optimal in the sense that they maximize the power transmitted to the pulsating flow at the expense of maximum dissipation.
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Papers by Jesus Antonio del Rio