Exploring the Role of Indirect Coupling in Complex Networks: The Emergence of Chaos and Entropy in Fractional Discrete Nodes.

Understanding the dynamics of complex systems defined in the sense of Caputo, such as fractional differences, is crucial for predicting their behavior and improving their functionality. In this paper, the emergence of chaos in complex dynamical networks with indirect coupling and discrete systems, both utilizing fractional order, is presented. The study employs indirect coupling to produce complex dynamics in the network, where the connection between the nodes occurs through intermediate fractional order nodes. The temporal series, phase planes, bifurcation diagrams, and Lyapunov exponent are considered to analyze the inherent dynamics of the network. Analyzing the spectral entropy of the chaotic series generated, the complexity of the network is quantified. As a final step, we demonstrate the feasibility of implementing the complex network. It is implemented on a field-programmable gate array (FPGA), which confirms its hardware realizability.

Laguerre Wavelet Approach for a Two-Dimensional Time-Space Fractional Schrödinger Equation.

This article is devoted to the determination of numerical solutions for the two-dimensional time-spacefractional Schrödinger equation. To do this, the unknown parameters are obtained using the Laguerre wavelet approach. We discretize the problem by using this technique. Then, we solve the discretized nonlinear problem by means of a collocation method. The method was proven to give very accurate results. The given numerical examples support this claim.

A New Fractional-Order Chaotic System with Different Families of Hidden and Self-Excited Attractors.

In this work, a new fractional-order chaotic system with a single parameter and four nonlinearities is introduced. One striking feature is that by varying the system parameter, the fractional-order system generates several complex dynamics: self-excited attractors, hidden attractors, and the coexistence of hidden attractors. In the family of self-excited chaotic attractors, the system has four spiral-saddle-type equilibrium points, or two nonhyperbolic equilibria. Besides, for a certain value of the parameter, a fractional-order no-equilibrium system is obtained. This no-equilibrium system presents a hidden chaotic attractor with a `hurricane'-like shape in the phase space. Multistability is also observed, since a hidden chaotic attractor coexists with a periodic one. The chaos generation in the new fractional-order system is demonstrated by the Lyapunov exponents method and equilibrium stability. Moreover, the complexity of the self-excited and hidden chaotic attractors is analyzed by computing their spectral entropy and Brownian-like motions. Finally, a pseudo-random number generator is designed using the hidden dynamics.

[Assessment of differential lung function by electrical impedance tomography]. / Evaluación de la función pulmonar unilateral mediante tomografía por impedancia eléctrica.

OBJECTIVE: To compare unilateral lung function estimated by 2 methods: electrical impedance tomography (EIT) and ventilation-perfusion lung scintigraphy. PATIENTS AND METHODS: This prospective clinical study was carried out in the pulmonary function laboratory of a general hospital. Twenty patients diagnosed with lung cancer (17 men and 3 women, ranging in age from 25 to 77 years) who were candidates for lung resection underwent ventilation-perfusion lung scanning breathing a radioactive gas. Differential lung function was estimated based on images taken at 2 intercostal spaces in which ventilation and perfusion were represented by changes in bioelectrical impedance. Each lung's contribution to overall respiratory function was also calculated based on scintigraphy. RESULTS: The right lung contributed a mean (SD) of 54% (9%) of ventilation (range, 32%-71%) according to EIT. Scintigraphy similarly estimated the right lung's contribution to be 52% (10%) of total ventilation (range, 31%-80%) and 50% (9%) of perfusion (range, 37%-71%). The difference between the 2 estimates was not significant (t test), and the correlation coefficients between them were r=0.90 for ventilation and r=0.72 for perfusion (P< .05 in both cases). The analysis of agreement showed that the mean difference between the methods was 1.9% (95% confidence interval [CI], 10.5% to -6.8%) for ventilation and 3.4% (95% CI, 17.1% to -10.3%) for perfusion. CONCLUSIONS: EIT is able to estimate differential lung function as accurately as ventilation-perfusion scintigraphy.

Evaluación de la función pulmonar unilateral mediante tomografía por impedancia eléctrica / Assessment of differential lung function by electrical impedance tomography

OBJETIVO: Comparar la función pulmonar unilateral (FPU) estimada mediante tomografía por impedancia eléctrica (TIE) con la misma determinación obtenida a partir de la gammagrafía de ventilación y perfusión pulmonar PACIENTES Y MÉTODOS: Se trata de un estudio clínico prospectivo, realizado en un laboratorio de función pulmonar de un hospital general. Se incluyó a 20 pacientes diagnosticados de cáncer de pulmón (17 varones y 3 mujeres, con edades comprendidas entre los 25 y los 77 años), candidatos a cirugía resectiva pulmonar, a quienes se realizó un estudio de ventilación/perfusión pulmonar con radioisótopos. La FPU se calculó a partir de imágenes en 2 espacios intercostales en las que se representaban la ventilación y la perfusión relacionadas con los cambios en la bioimpedancia eléctrica. Se determinó asimismo la participación de cada pulmón en la función global a partir de estudios isotópicos. RESULTADOS: El valor promedio ± desviación estándar de ventilación en el pulmón derecho obtenido mediante TIE fue del 54 ± 9% (rango: 32-71%). El mismo valor mediante radioisótopos fue del 52 ± 10% (rango: 31-80%) para la ventilación y del 50 ± 9% (rango: 37-71%) para la perfusión (prueba de la t de Student, p no significativa). El coeficiente de correlación entre ambas determinaciones fue de r = 0,90 (p < 0,05) para la ventilación y de r = 0,72 (p < 0,05) para la perfusión. El análisis de concordancia mostró una media de las diferencias del 1,9% (intervalo de confianza del 95%, del 10,5 al -6,8%) para la ventilación y del 3,4% (intervalo de confianza del 95%, entre el 17,1 y el -10,3%) para la perfusión. CONCLUSIONES: La TIE es capaz de cuantificar la FPU con una precisión similar a la gammagrafía de ventilación o perfusión con radioisótopos

OBJECTIVE: To compare unilateral lung function estimated by 2 methods: electrical impedance tomography (EIT) and ventilation-perfusion lung scintigraphy. PATIENTS AND METHODS: This prospective clinical study was carried out in the pulmonary function laboratory of a general hospital. Twenty patients diagnosed with lung cancer (17 men and 3 women, ranging in age from 25 to 77 years) who were candidates for lung resection underwent ventilation-perfusion lung scanning breathing a radioactive gas. Differential lung function was estimated based on images taken at 2 intercostal spaces in which ventilation and perfusion were represented by changes in bioelectrical impedance. Each lung's contribution to overall respiratory function was also calculated based on scintigraphy. RESULTS: The right lung contributed a mean (SD) of 54% (9%) of ventilation (range, 32%-71%) according to EIT. Scintigraphy similarly estimated the right lung's contribution to be 52% (10%) of total ventilation (range, 31%-80%) and 50% (9%) of perfusion (range, 37%-71%). The difference between the 2 estimates was not significant (t test), and the correlation coefficients between them were r=0.90 for ventilation and r=0.72 for perfusion (P<.05 in both cases). The analysis of agreement showed that the mean difference between the methods was 1.9% (95% confidence interval [CI], 10.5% to -6.8%) for ventilation and 3.4% (95% CI, 17.1% to -10.3%) for perfusion. CONCLUSIONS: EIT is able to estimate differential lung function as accurately as ventilation-perfusion scintigraphy

[Problems and resources among hospital physicians, residents, and nurses in their hospital work]. / Problemas y recursos de médicos de planta, residentes y enfermeros en el ejercicio de su trabajo hospitalario.

Research about fieldwork with 133 health professionals from different hospitals in Buenos Aires city about both functional and disfunctional discomfort perceived and expressed by them. Risk factors/items described are: work in isolation, naturalizing of discomfort, overload, overadaptation, inappropriate relieving methods: tobacco, alcohol, too much or insufficient food, anxiety, self - carelessness, both physical or emotional, unawareness of their rights as workers. Work in hospitals also provides satisfaction. Some questions and reflexions are stated and a minimum decalogue of measures to prevent and promote health in hospital workers is proposed.

Problemas y recursos de médicos de planta, residentes y enfermeros en el ejercicio de su trabajo hospitalario / [Problems and resources among hospital physicians, residents, and nurses in their hospital work]

Research about fieldwork with 133 health professionals from different hospitals in Buenos Aires city about both functional and disfunctional discomfort perceived and expressed by them. Risk factors/items described are: work in isolation, naturalizing of discomfort, overload, overadaptation, inappropriate relieving methods: tobacco, alcohol, too much or insufficient food, anxiety, self - carelessness, both physical or emotional, unawareness of their rights as workers. Work in hospitals also provides satisfaction. Some questions and reflexions are stated and a minimum decalogue of measures to prevent and promote health in hospital workers is proposed.

Problemas y recursos de médicos de planta, residentes y enfermeros en el ejercicio de su trabajo hospitalario. / [Problems and resources among hospital physicians, residents, and nurses in their hospital work]

Research about fieldwork with 133 health professionals from different hospitals in Buenos Aires city about both functional and disfunctional discomfort perceived and expressed by them. Risk factors/items described are: work in isolation, naturalizing of discomfort, overload, overadaptation, inappropriate relieving methods: tobacco, alcohol, too much or insufficient food, anxiety, self - carelessness, both physical or emotional, unawareness of their rights as workers. Work in hospitals also provides satisfaction. Some questions and reflexions are stated and a minimum decalogue of measures to prevent and promote health in hospital workers is proposed.

Prevención en salud mental: escenarios actuales

Incluye: 1.-Prevención en ciudades de complejidad creciente (redes nómades; prevención y violencia; ocupándonos de la desocupación; la salud de los profesionales de la salud; síndrome de Burnout; prevención de la mala praxis) / 2.-Prevención y etapas vitales (prevención en la vejez; crisis vitales; denuncias de abuso sexual) / 3.- Prevención y algunos de los trastornos más frecuentes (adolescencia y trastornos de la conducta alimentaria; prevención y drogadicción; fertilización asistida; prevención en los trastornos de ansiedad; prevención en la enfermedad cardiovascular; prevención en trastornos afectivos) / 4.-Prevención y recursos para la salud (la vigencia de los Grupos Balint; grupos de reflexión y prevención del estrés laboral en personal de salud; Internet en la prevención de la salud mental urbana; deporte, prevención y salud mental; el arte en la promoción de la salud y la prevención de enfermedades)

Prevención en salud mental: escenarios actuales

Incluye: 1.-Prevención en ciudades de complejidad creciente (redes nómades; prevención y violencia; ocupándonos de la desocupación; la salud de los profesionales de la salud; síndrome de Burnout; prevención de la mala praxis) / 2.-Prevención y etapas vitales (prevención en la vejez; crisis vitales; denuncias de abuso sexual) / 3.- Prevención y algunos de los trastornos más frecuentes (adolescencia y trastornos de la conducta alimentaria; prevención y drogadicción; fertilización asistida; prevención en los trastornos de ansiedad; prevención en la enfermedad cardiovascular; prevención en trastornos afectivos) / 4.-Prevención y recursos para la salud (la vigencia de los Grupos Balint; grupos de reflexión y prevención del estrés laboral en personal de salud; Internet en la prevención de la salud mental urbana; deporte, prevención y salud mental; el arte en la promoción de la salud y la prevención de enfermedades)