Héctor Daniel López-Calderón, Hamlet Avilés‐Arnaut, Luis J. Galán‐Wong, Verónica Almaguer-Cantú, J.R. Laguna-Camacho, C. Calderón-Ramón, J. E. Escalante-Martínez, K. Arévalo-Niño,
Acceleration of wound healing can be achieved with the use of wound dressings. Through the electrospinning technique, a polymeric scaffold composed of two layers was processed: a gelatin and polyvinylpyrrolidone layer with gentamicin, and a second layer of cellulose acetate. The conditions for the electrospinning process were standardized for voltage parameters, feed flow and the distance from the injector to the collector. Once the values of the main variables for the electrospinning were optimized, ...
Tópico(s): Silk-based biomaterials and applications
2020 - Multidisciplinary Digital Publishing Institute | Polymers
Mario González-Lee, Héctor Vázquez-Leal, J.F. Gómez‐Aguilar, Luis J. Morales-Mendoza, V. M. Jiménez-Fernández, J.R. Laguna-Camacho, C. Calderón-Ramón,
In this paper, we explored the application of the fractional calculus to digital watermarking. In order to reach this goal, we chose a set of watermarking systems, and then, we altered the watermark detection step of each system. The novelty of our proposal is that we deviated from the trend of proposing new embedding domains computed by using fractional calculus principles. Instead, we proposed to reformulate the detection equation set. Then, this paper contributes to a new equation set for detecting ...
Tópico(s): Digital Media Forensic Detection
2018 - Institute of Electrical and Electronics Engineers | IEEE Access
J. E. Escalante-Martínez, J.F. Gómez‐Aguilar, C. Calderón-Ramón, Armando Aguilar-Meléndez, Pablo Padilla-Longoria,
This paper presents an alternative representation of a system of differential equations qualitatively showing the behavior of the biological rhythm of a crayfish during their transition from juvenile to adult stages. The model focuses on the interaction of four cellular oscillators coupled by diffusion of a hormone, a parameter [Formula: see text] is used to simulate the quality of communication among the oscillators, in biological terms, it measures developmental maturity of the crayfish. Since ...
Tópico(s): Fractional Differential Equations Solutions
2017 - World Scientific | International Journal of Biomathematics
Armando Aguilar-Meléndez, Mario Ordaz, Josep de la Puente, Sergio Natan González Rocha, Héctor E. Rodríguez Lozoya, Alejandro Córdova Ceballos, Alejandro García Elías, C. Calderón-Ramón, J. E. Escalante-Martínez, J.R. Laguna-Camacho, Amelia Campos Rios,
The probabilistic seismic hazard assessment (PSHA) is a fundamental step to generate information that can contribute to reduce the seismic risk in cities. This reduction is essential to increase the resilience of the cities. Nowadays, there are different types of software that can be used to perform PSHA. In the present document a recent version of the CRISIS software to perform PSHA is described. CRISIS2015 is a versatile tool to perform PSHA. The first version of CRISIS was done more than fifteen ...
Tópico(s): Seismology and Earthquake Studies
2017 - National Polytechnic Institute | Computación y Sistemas
J. E. Escalante-Martínez, J.F. Gómez‐Aguilar, C. Calderón-Ramón, Luis J. Morales-Mendoza, Ines Cruz-Orduña, JR Laguna-Camacho,
In this article, we obtain the viscous damping coefficient β theoretically and experimentally in the spring–mass–viscodamper system. The calculation is performed to obtain the quasi-period τ. The influence of the viscosity of the fluid and the damping coefficient is analyzed using three fluids, water, edible oil, and gasoline engine oil SAE 10W-40. These processes exhibit temporal fractality and non-local behaviors. Our general non-local damping model incorporates fractional derivatives of Caputo ...
Tópico(s): Nonlinear Dynamics and Pattern Formation
2016 - SAGE Publishing | Advances in Mechanical Engineering
J.F. Gómez‐Aguilar, J. E. Escalante-Martínez, C. Calderón-Ramón, Luis J. Morales-Mendoza, M. Benavidez-Cruz, Mario González-Lee,
We present an alternative representation of integer and fractional electrical elements in the Laplace domain for modeling electrochemical systems represented by equivalent electrical circuits. The fractional derivatives considered are of Caputo and Caputo-Fabrizio type. This representation includes distributed elements of the Cole model type. In addition to maintaining consistency in adjusted electrical parameters, a detailed methodology is proposed to build the equivalent circuits. Illustrative ...
Tópico(s): Thermodynamic and Structural Properties of Metals and Alloys
2016 - Hindawi Publishing Corporation | Advances in Mathematical Physics
J.F. Gómez‐Aguilar, H. Yépez-Martínez, C. Calderón-Ramón, Ines Cruz-Orduña, R.F. Escobar-Jiménez, V. H. Olivares-Peregrino,
In this paper, the fractional equations of the mass-spring-damper system with Caputo and Caputo–Fabrizio derivatives are presented. The physical units of the system are preserved by introducing an auxiliary parameter σ. The input of the resulting equations is a constant and periodic source; for the Caputo case, we obtain the analytical solution, and the resulting equations are given in terms of the Mittag–Leffler function; for the Caputo–Fabrizio approach, the numerical solutions are obtained by ...
Tópico(s): Iterative Methods for Nonlinear Equations
2015 - Multidisciplinary Digital Publishing Institute | Entropy
J.R. Laguna-Camacho, Gabriel Juárez-Morales, C. Calderón-Ramón, Víctor Velázquez-Martínez, I. Hernández-Romero, Juan Vicente Méndez‐Méndez, M. Vite-Torres,
In the present work, a study and description of the wear mechanisms implied in disk and shoe pads (bodies) was presented. These were subjected to real service, roughly 8 months, in a city as Poza Rica in Mexico that is extremely warm (high temperatures between 40 °C and 50 °C), which lead to cause a more rapid wear process. The surface characteristics and the differences in the wear modes of the brake pads were shown. These observations allowed concluding that high sliding and abrasion wear deformed ...
Tópico(s): Tribology and Wear Analysis
2015 - Elsevier BV | Engineering Failure Analysis
J. E. Escalante-Martínez, J.F. Gómez‐Aguilar, C. Calderón-Ramón, Armando Aguilar-Meléndez, Pablo Padilla-Longoria,
In this paper, a system of fractional differential equations that model the synchronized bioluminescence behavior of a set of fireflies put on two spatial arrangements is presented; the alternative representation of these equations contains fractional operators of Liouville–Caputo type. The objective of the model is to qualitatively recover synchronization and show that it is persistent. It is shown that the effort made by each firefly glow changes with respect to the number of male competitors ...
Tópico(s): stochastic dynamics and bifurcation
2018 - World Scientific | International Journal of Biomathematics
J.F. Gómez‐Aguilar, R.F. Escobar-Jiménez, V. H. Olivares-Peregrino, M. Benavides-Cruz, C. Calderón-Ramón,
In this paper, we present an analysis and modeling of the electrical diffusion equation using the fractional calculus approach. This alternative representation for the current density is expressed in terms of the Caputo derivatives, the order for the space domain is [Formula: see text] and for the time domain is [Formula: see text]. We present solutions for the full fractional equation involving space and time fractional derivatives using numerical methods based on Fourier variable separation. The ...
Tópico(s): Nonlinear Differential Equations Analysis
2015 - World Scientific | International Journal of Modern Physics C
Olalla Calvo-Lozano, Anna Aviñó, Vicente Friaza, Alfonso Medina-Escuela, César S. Huertas, Enrique J. Calderón, Ramón Eritja, Laura M. Lechuga,
Pneumocystis jirovecii is a fungus responsible for human Pneumocystis pneumonia, one of the most severe infections encountered in immunodepressed individuals. The diagnosis of Pneumocystis pneumonia continues to be challenging due to the absence of specific symptoms in infected patients. Moreover, the standard diagnostic method employed for its diagnosis involves mainly PCR-based techniques, which besides being highly specific and sensitive, require specialized personnel and equipment and are time- ...
Tópico(s): Synthesis and Biological Evaluation
2020 - Multidisciplinary Digital Publishing Institute | Nanomaterials
Óscar Girón Vallejo, Darío García‐Calderón, Ramón Ruiz‐Pruneda, R. Cabello, Ernesto Doménech‐Abellán, José Luis Fuster‐Soler, J.I. Ruiz-Jiménez,
Abstract Nephron sparing surgery (NSS) is increasingly utilized to treat patients with bilateral Wilms tumor. We present a case of NSS planning using a three‐dimensional computerized and printed model of both kidneys with anatomical structures of interest (parenchyma, renal pelvis, major calyx, renal artery, renal vein, and tumor). This model allowed a better understanding of the anatomic relation between the tumor and the normal kidney on each side, improving the surgical planning and the preoperative ...
Tópico(s): Organ Donation and Transplantation
2017 - Wiley | Pediatric Blood & Cancer
G. C. Tettamanzi, J. Verduijn, G. P. Lansbergen, M. Blaauboer, M. J. Calderón, Ramón Aguado, Sven Rogge,
Semiconductor nano-devices have been scaled to the level that transport can be dominated by a single dopant atom. In the strong coupling case a Kondo effect is observed when one electron is bound to the atom. Here, we report on the spin as well as orbital Kondo ground state. We experimentally as well than theoretically show how we can tune a symmetry transition from a SU(4) ground state, a many body state that forms a spin as well as orbital singlet by virtual exchange with the leads, to a pure ...
Tópico(s): Graphene research and applications
2012 - American Physical Society | Physical Review Letters
Alvaro Calderón, Ramón Casilda,
Luego de más de diez años de un amplio y extenso proceso de libcralización y desrcgulación financiera, el panorama latinoamericano de los mercados bancario, de seguros y de los fondos de pensiones ha sido modificado por la masiva presencia de entidades financieras globales. En este escenario los grandes bancos españoles han sido actores centrales, convirtiéndose en líderes en la mayoría de los países y los segmentos del negocio. Desde la perspectiva latinoamericana, el ingreso de los bancos extranjeros, ...
Tópico(s): Banking stability, regulation, efficiency
2000 - United Nations Publications | Revista de la CEPAL
M. Benavides-Cruz, C. Calderón-Ramón, J.F. Gómez‐Aguilar, M. Rodrı́guez-Achach, I. Cruz-Orduña, J.R. Laguna-Camacho, Luis J. Morales-Mendoza, M. Enciso-Aguilar, H. Pérez-Meana, J. E. Escalante-Martínez, Jesús Enrique López-Calderón, G. Juárez-Morales,
In this paper, we present an analysis and modeling of the interaction of electromagnetic fields with metallic nanostructures using computational tools that allow us to study the phenomena that are produced as an electromagnetic field interacts with the nanostructure. The analysis of dielectric systems including metals can be very complicated because of the metal parameters. For this reason, we propose to integrate the dielectric function of the Lorentz-Drude model with the finite difference time- ...
Tópico(s): Microwave Engineering and Waveguides
2015 - World Scientific | International Journal of Modern Physics C
Luis A. Rojas, Rafael Moreno, Hugo Calderón, Ramón Alemany,
Tópico(s): RNA Interference and Gene Delivery
2016 - Springer Nature | Cancer Gene Therapy
Fernando Pasterán, Ezequiel Albornoz, Diego Faccone, Sonia Gómez, Claudia Valenzuela, Mònica Morales, Paula Estrada, Laura Valenzuela, Jorge Matheu, Leonor Guerriero, Enrique Arbizú, Y. Calderon, Pilar Ramón-Pardo, Alejandra Corso,
Servicio Antimicrobianos, Instituto Nacional de Enfermedades Infecciosas (INEI)-ANLIS ‘Dr. Carlos G. Malbran’, Ciudad Autonoma de Buenos Aires, Argentina; Seccion Bacteriologia, UCREVE/ Laboratorio Nacional de Salud, Ciudad de Guatemala, Guatemala; Hospital Infantil de Infectologia y Rehabilitacion, Ciudad de Guatemala, Guatemala; Hospital General San Juan de Dios, Ciudad de Guatemala, Guatemala; Alert and Response and Epidemic Diseases, Pan American Health Organization/World Health Organization, ...
Tópico(s): Enterobacteriaceae and Cronobacter Research
2012 - Oxford University Press | Journal of Antimicrobial Chemotherapy
Amos Buchner, Shlomo Calderon, Yochanan Ramon,
A study was made of a series of 302 consecutive cases of localized hyperplastic lesions of the gingiva (epulides). The lesions were classified into five groups: pyogenic granuloma, calcifying fibroblastic granuloma, fibrous hyperplasia, peripheral giant cell granuloma and denture hyperplasia. The study indicates that there are some differences in age and sex distribution as well as in location between the different histological groups. Pyogenic granuloma was found to be the most common lesion on ...
Tópico(s): Sarcoma Diagnosis and Treatment
1977 - Wiley | Journal of Periodontology
Josep M. Badía, Inés Rubio-Pérez, José López Menéndez, Cecilia Díez-García, Bader Al-Raies Bolaños, Julia Ocaña-Guaita, Xosé Manuel Meijome Sánchez, Manuel Chamorro‐Pons, Ramón Calderón-Nájera, Gloria Ortega‐Pérez, Rosa Paredes-Esteban, Cristina Sánchez-Viguera, Ramón Vilallonga, Antonio Picardo, Elena Bravo-Brañas, Eloy Espin, José M. Balibrea,
Despite the dissemination of guidelines for surgical site infection (SSI) prevention, a gap between the theoretical measures and their compliance persists. Accurate estimates of the implementation of preventative measures is crucial before planning dissemination strategies. A web-based survey was distributed to members of 11 Associations of operative nurses and surgeons. Questions aimed to determine their awareness of evidence, personal beliefs and actual use of the main preventative measures. Of ...
Tópico(s): Orthopedic Infections and Treatments
2020 - Wolters Kluwer | International Journal of Surgery
Cristóbal Calderón-Reyes, Ramón Silva Pezoa, Pamela Leal, Alejandra Ribera-Fonseca, Cristina Cáceres, Ismael Riquelme, Tomás Zambrano, Daniela Peña, Miren Alberdi, Marjorie Reyes‐Díaz,
Tópico(s): Phytochemical Studies and Bioactivities
2020 - Springer Science+Business Media | Journal of soil science and plant nutrition
M. Benavides, Mariela L. Álvarez, C. Calderón-Ramón, Julio C. Sosa, M. Galaz, Manuel Cruz Rodriguez, M. Enciso-Aguilar, C. Márquez,
We propose a new set of reduced equations describing the Perfectly Matched Layer (PML) boundary condition for the Finite Difference Time Domain Method (FDTD) algorithm. These expressions take into account the main properties of the electromagnetic wave propagation in continuos medias: absorbing, free space and conductive, simplifying the solution of electromagnetic problems as such as the FDTD lattice. A two-dimensional (2-D) transversal electric TE mode Gaussian pulse propagating along free-space ...
Tópico(s): Electromagnetic Scattering and Analysis
2011 - | Revista Mexicana de Física E
Alberto Romero, Carlos Alonso, Ignacio Marı́n, Jeremy Grimshaw, Ernesto de la Torre Villar, Manuel Rincón, Antonio Reyes, Eduardo Briones, Enrique J. Calderón, Juan Ramón Lacalle-Remigio, James Jaffey,
La práctica clínica en la angina inestable (AI) no está siempre basada en la major evidencia disponible. Las guías clínicas tienen el potencial de mejorar la calidad de la asistencia. Hasta el momento no hay ningún ensayo clínico aleatorizado para evaluar diversas estrategias de implantación de guías en el sistema sanitario público español. El objetivo de este artículo es comparar la efectividad de una estrategia multifactorial de implantación de una guía clínica (sesiones formativas interactivas, ...
Tópico(s): Health Systems, Economic Evaluations, Quality of Life
2005 - Elsevier BV | Revista Española de Cardiología
J.F. Gómez‐Aguilar, Enrique Escalante, C. Calderón-Ramón, Luis Morales, Mário H. Gonzalez, Rodrigo Laguna,
Abstract This paper presents the alternative construction of the diffusion-advection equation in the range (1; 2). The fractional derivative of the Liouville-Caputo type is applied. Analytical solutions are obtained in terms of Mittag-Leffler functions. In the range (1; 2) the concentration exhibits the superdiffusion phenomena and when the order of the derivative is equal to 2 ballistic diffusion can be observed, these behaviors occur in many physical systems such as semiconductors, quantum optics, ...
Tópico(s): Nonlinear Differential Equations Analysis
2016 - De Gruyter Open | Open Physics
Alvaro Calderón, Ramón Casilda,
After more than ten years of a broad-ranging and extensive process of financial liberalization and deregulation, the Latin American picture in the banking, insurance and pension fund markets has been significantly changed by the massive presence of globalized financial institutions. The major Spanish banks have been among the main actors in this respect and have become leading figures in most countries and business segments. From the Latin American standpoint, the entry of foreign banks, especially ...
Tópico(s): Banking stability, regulation, efficiency
2000 - United Nations Publications | CEPAL review
José-Maria Calderón Moreno, Ramón Torrecillas,
Tópico(s): Advanced materials and composites
1997 - Trans Tech Publications | Key engineering materials
Edurne Marin, Neha Tiwari, Marcelo Calderón, Jose‐Ramon Sarasua, Aitor Larrañaga,
Polymer capsules fabricated via the layer-by-layer (LbL) approach have emerged as promising biomedical systems for the release of a wide variety of therapeutic agents, owing to their tunable and controllable structure and the possibility to include several functionalities in the polymeric membrane during the fabrication process. However, the limitation of the capsules with a single functionality to overcome the challenges involved in the treatment of complex pathologies denotes the need to develop ...
Tópico(s): Graphene and Nanomaterials Applications
2021 - American Chemical Society | ACS Applied Materials & Interfaces
Ruben Guilarte, B. Berenguer Frönher, P. Rodríguez Urcelay, Ramón Calderón Nájera, B. González Meli, J. Enríquez de Salamanca Celada,
A case of successful reduction glossectomy for idiopathic macroglossia is presented. Macroglossia varies in its degree of severity. With pronounced macroglossia, respiratory and feeding difficulties may ensue. Persistent macroglossia leads to speech problems and anterior open bite. The cause of macroglossia must be clearly defined, and true macroglossia separated from pseudomacroglossia. There are many congenital and acquired causes of true macroglossia. By far, the most common cause of macroglossia ...
Tópico(s): Blood disorders and treatments
2008 - Elsevier BV | Journal of Plastic Reconstructive & Aesthetic Surgery
A.T. Abreu y Abreu, M.P. Milke-García, G.A. Argüello-Arévalo, Calderón de la Barca, Ramón Carmona-Sánchez, Alejandra Consuelo‐Sánchez, Enrique Coss‐Adame, Maria F. Garcia Cedillo, V. Hernández-Rosiles, M.E. Icaza-Chávez, Jennifer N. Martinez-Medina, Sofía Morán‐Ramos, E. Ochoa-Ortiz, M. Reyes-Apodaca, R.L. Rivera-Flores, F. Zamarripa-Dorsey, Flora Zárate‐Mondragón, R. Vázquez-Frías,
Dietary fiber intake is one of the most influential and efficacious strategies for modulating the gut microbiota. Said fiber can be digested by the microbiota itself, producing numerous metabolites, which include the short-chain fatty acids (SCFAs). SCFAs have local and systemic functions that impact the composition and function of the gut microbiota, and consequently, human health. The aim of the present narrative review was to provide a document that serves as a frame of reference for a clear understanding ...
Tópico(s): Food composition and properties
2021 - Elsevier BV | Revista de Gastroenterología de México (English Edition)
A.T. Abreu y Abreu, M.P. Milke-García, G.A. Argüello-Arévalo, Calderón de la Barca, Ramón Carmona-Sánchez, Alejandra Consuelo‐Sánchez, Enrique Coss‐Adame, Maria F. Garcia Cedillo, V. Hernández-Rosiles, M.E. Icaza-Chávez, Jennifer N. Martinez-Medina, Sofía Morán‐Ramos, E. Ochoa-Ortiz, M. Reyes-Apodaca, R.L. Rivera-Flores, F. Zamarripa-Dorsey, Flora Zárate‐Mondragón, R. Vázquez-Frías,
Una de las estrategias que más impacto y mayor eficacia tiene para la modulación de la microbiota intestinal es el consumo de fibra dietaria, que puede ser digerida por la propia microbiota generando numerosos metabolitos. Entre estos, se encuentran los ácidos grasos de cadena corta (AGCC) con funciones tanto locales como sistémicas, que impactan en la composición y función de la microbiota intestinal y por lo tanto en la salud humana. El objetivo de esta revisión narrativa fue generar un documento ...
Tópico(s): Food composition and properties
2021 - Elsevier BV | Revista de Gastroenterología de México
J.F. Gómez‐Aguilar, H. Yépez-Martínez, C. Calderón-Ramón, M. Benavidez-Cruz, Luis J. Morales-Mendoza,
AbstractWe present the fractional wave equation in a conducting material. We used a Maxwell's equations with the assumptions that the charge density and current density J were zero, and that the permeability and permittivity were constants. The fractional wave equation will be examined separately; with fractional spatial derivative and fractional temporal derivative, finally, consider a Dirichlet conditions, the Fourier method was used to find the full solution of the fractional equation in analytic ...
Tópico(s): Nonlinear Waves and Solitons
2015 - Taylor & Francis | Journal of Electromagnetic Waves and Applications