El texto presenta la crítica heideggeriana a los conceptos de teoría y praxis, tal como han sido acuñados por la tradición filosófica. El artículo muestra el giro transformador que hace el filósofo alemán en el tratamiento de estas dos nociones, con el fin de delinear una nueva concepción de filosofía, a propósito de la crítica y transformación de estas concepciones. La crítica se centra en señalar cómo en la tradición filosófica ha preponderado la teoría, comprendida desde una visión lógico – (...) racional, y la comprensión de la praxis como una instancia a-teórica, lo que deja de lado las consideraciones prácticas centrales y primarias implicadas en el pensar, y el ejercicio práctico como instancia comprensiva y de pensamiento. En este sentido, se muestra la reivindicación de la praxis, de la cotidianidad y de la situación fáctica como aspectos de central importancia en el ser del Dasein; y se plantea una nueva comprensión de lo que implica la teoría y las nuevas relaciones que se establecen en el nexo teoría – praxis como posibilidades del ser del Dasein, sin caer en el primado de la una sobre la otra, lo que implica la transformación de sus modos de comprensión. Finalmente, se muestra cómo un ejercicio filosófico desde estas intuiciones se encuentra más cercano a la comprensión e interpretación práctica que al desarrollo de teorías en el sentido clásico del término. (shrink)

Este artículo presenta la cuestión de si las creencias religiosas son o no razonables, es decir, si tienen o no una evidencia razonable que las sustente. El interés no es comprobar la existencia de Dios, sino simplemente saber si el lenguaje religioso como tal tiene o no sentido. Para esto, primero veremos la concepción de la creencia en general. A continuación, trataremos las creencias religiosas bajo dos puntos de vistas totalmente opuestos: por un lado, se expondrá la posición de autores (...) que dicen que las creencias religiosas sí tienen una evidencia razonable que las sustenta y, por otro, nos encontraremos con autores que afirman que dichas creencias no pueden ser justificadas racionalmente porque lo espiritual refiere el ámbito de lo indecible, en el cual no es factible afirmar que los enunciados religiosos son apropiados a ser verdaderos o falsos. (shrink)

ABSTRACT In Mexico informed consent is a legal requirement that ensures that patients who are invited to participate in clinical trials are provided with all the information needed to decide whether to participate, or not, in a research protocol. To improve our understanding of the problems physicians in developing countries encounter, when obtaining informed consent (IC), we examined their opinion on the importance of IC in clinical research, the quantity and quality of the information provided to the participant, and the (...) conditions in which the IC is obtained. Investigators considered that IC was useful to the patients, providing information that helped the patient to make a decision about his/her participation. Nevertheless, they felt that for some aspects of the research, like drug development in general, the use of placebos, and the randomization process, many of the patients were not capable of fully understanding the information provided, referring to the complexity of the information and illiteracy as the main reasons. Many investigators were not acquainted with some of the guidelines established in the Mexican General Law of Health,1 36% of them admitting to not having completed their IC letters. Most investigators gave only minutes to the patient to make a decision and 20% of ICs were obtained while the patient was hospitalized. Except for one investigator, all of them considered that specific training in medical ethics would be useful for the daily clinical work. (shrink)

The struggle for the recognition of indigenous rights is one of the most important social movements in Mexico. Before the 1970s, existing peasant organizations did not represent indigenous concerns. Since 1975 there has been a resurgence of indigenous movements and have raised new demands and defense of their cultural values. However, indigenous social mobilization had been laid in local and regional peasant struggles across the 1970s and 1980s. Also the indigenous movement is not homogeneous and does not include all ethnic (...) groups in the country, but it has many different expressions and encompasses different entities at local, regional and national levels. This paper aims to analyze the historical social approach and under the frame of indigenous political ecology of social movements for recognition of indigenous rights in contemporary Mexico. (shrink)

Proximity and interpersonal contact are prominent components of social connection. Giving affective touch to others is fundamental for human bonding. This brief report presents preliminary results from a pilot study. It explores if exposure to bonding scenes impacts the activity of specific muscles related to physical interaction. Fingers flexion is a very important component when performing most actions of affectionate contact. We explored the visuo-motor affective interplay by priming participants with bonding scenes and assessing the electromyographic activity of the fingers (...) flexor muscle, in the absence of any overt movements. Photographs of dyads in social interaction and of the same dyads not interacting were employed. We examined the effects upon the electromyographical activity: during the passive exposure to pictures, and during picture offset and when expecting the signal to perform a fingers flexion task. Interacting dyads compared to matched non-interacting dyads increased electromyographic activity of the fingers flexor muscle in both contexts. Specific capture of visual bonding cues at the level of visual cortex had been described in the literature. Here we showed that the neural processing of visual bonding cues reaches the fingers flexor muscle. Besides, previous visualization of bonding cues enhanced background electromyographic activity during motor preparation to perform the fingers flexion task, which might reflect a sustained leakage of central motor activity downstream leading to increase in firing of the respective motor neurons. These data suggest, at the effector level, an implicit visuo-motor connection in which social interaction cues evoke intrinsic dispositions toward affectionate social behavior. (shrink)

Mostramos el valor de los estudios biográficos para comprender los modos de ser sujetos en comunidades de diversa tolerancia hacia las prácticas homoeróticas. El texto reflexiona sobre la constitución de comunidades imaginarias a partir de trabajos etnográficos en comunidades indígenas; la participación de medios de comunicación; las injerencias de ONG sobre la comunidad zapoteca, en especial en Juchitán, tierra de tolerancias sexual hacia los muxes. Los muxes cumplen diversas tares sociales y culturales, son hombres con prácticas homoeróticas con otros hombres (...) que ni ellos ni el grupo social considera homosexuales. Los zapotecas forman parte de los grupos originarios del sur de México, tienen fuerte presencia en el país en su conjunto, desarrollan prácticas de amplia participación de la mujer, tanto así que algunos científicos sociales la han denominado cultura matriarcal. En el presente documento se discuten seis asuntos sobre la región a partir de argumentos generados por un miembro de amplio reconocimiento en la región de Juchitán: 1) la valoración del rol de la mujer al considerar que es un grupo con prácticas matriarcales; 2) el mito del paraíso de la izquierda; 3) el mito del paraíso gay; 4) la idea de un tercer sexo; 5) la idea de aceptación generalizada de los muxes; 6) la generalización del travestismo. Finalmente, se plantean algunos efectos de la intervención de los científicos sociales, de los medios de difusión masiva y de las ONG sobre la profesionalización del pueblo para dar respuesta a la diversidad de intereses de los externos a la comunidad. (shrink)

The emergent Coronavirus Disease 2019 caused by the Severe Acute Respiratory Syndrome Coronavirus 2 could produce a maternal immune activation via the inflammatory response during gestation that may impair fetal neurodevelopment and lead to postnatal and adulthood mental illness and behavioral dysfunctions. However, so far, limited evidence exists regarding long-term physiological, immunological, and neurodevelopmental modifications produced by the SARS-CoV-2 in the human maternal-fetal binomial and, particularly, in the offspring. Relevant findings derived from epidemiological and preclinical models show that a MIA (...) is indeed linked to an increased risk of neurodevelopmental disorders in the offspring. We hypothesize that a gestational infection triggered by SARS-CoV-2 increases the risks leading to neurodevelopmental disorders of the newborn, which can affect childhood and the long-term quality of life. In particular, disruption of either the maternal or the fetal cholinergic anti-inflammatory pathway could cause or exacerbate the severity of COVID-19 in the maternal-fetal binomial. From a translational perspective, in this paper, we discuss the possible manifestation of a MIA by SARS-CoV-2 and the subsequent neurodevelopmental disorders considering the role of the fetal-maternal cytokine cross-talk and the CAP. Specifically, we highlight the urgent need of preclinical studies as well as multicenter and international databanks of maternal-fetal psychophysiological data obtained pre-, during, and post-infection by SARS-CoV-2 from pregnant women and their offspring. (shrink)

El presente artículo pretende mostrar la profunda interrelación entre el Misterio, el silencio, la experiencia espiritual y el arte. Con ello se busca subrayar el requisito de la representación perteneciente a la experiencia espiritual a través del símbolo. El acontecer del Misterio y su acogida por parte del ser humano implica, en sí mismo, la necesidad del silencio y la contemplación. Estas dos características son elementos indispensables para identificar la autenticidad del ser humano espiritual. Aunque el silencio y la contemplación (...) parezcan hablar sobre la «pasividad» de lo humano, el dinamismo que se genera en la vivencia de esta experiencia impulsa al sujeto a expresar de diversas formas una realidad que lo trasciende y fascina. La vía más adecuada de esta expresión es el símbolo, el cual busca representar una vivencia que comunica y transforma. La fuerza de la creación y transformación constante de este proceso permite descubrir, en la obra de arte, el signo visible de la auto-revelación del Misterio Santo. Ante el bullicio del mundo contemporáneo, que no da lugar al recogimiento, esta reflexión se presenta como una alternativa para profundizar sobre la necesidad de la espiritualidad en la configuración de lo humano. (shrink)

It is assumed that social bonds in humans have consequences for virtually all aspects of behavior. Social touch-based contact, particularly hand caressing, plays an important role in social bonding. Pre-programmed neural circuits likely support actions (or predispositions to act) towards caressing contacts. We searched for pre-set motor substrates towards caressing by exposing volunteers to bonding cues and having them gently stroke a very soft cloth, a caress-like movement. The bonding cues were pictures with interacting dyads and the control pictures presented (...) non-interacting dyads. We focused on the readiness potential, an electroencephalographic marker of motor preparation that precedes movement execution. The amplitude of the readiness potential preceding the grasping of pleasant emotional-laden stimuli was previously shown to be reduced compared with neutral ones. Fingers flexor electromyography measured action output. The rationale here is that stroking the soft cloth when previously exposed to bonding cues, a compatible context, would result in smaller amplitudes of readiness potentials, as compared to the context with no such cues. Exposure to the bonding pictures increased subjective feelings of sociability and decreased feelings of isolation. Participants who more frequently engage in mutual caress/groom a “significant other” in daily life initiated the motor preparation earlier, reinforcing the caress-like nature of the task. As hypothesized, readiness potentials preceding the caressing of the soft cloth were significantly reduced under exposure to bonding as compared to control pictures. Furthermore, an increased fingers flexor electromyographic activity was identified under exposure to the former as compared to the latter pictures. The facilitatory effects are likely due to the recruitment of pre-set cortical motor repertoires related to caress-like movements, emphasizing the distinctiveness of neural signatures for caress-like movements. (shrink)

The only test theory used by workers in the field of testing special relativity to analyze the significance of their experiments is the proof by H. P. Robertson [Rev. Mod. Phys. 21, 378 (1949)] of the Lorentz transformations from the results of the experimental evidence. Some researchers would argue that the proof contains an unwarranted assumption disguised as a convention about synchronization procedures. Others would say that alternative conventions are possible. In the present paper, no convention is used, but the (...) Lorentz transformations are still obtained using only the results of the experiments in Robertson's proof, namely the Michelson-Morley, Kennedy-Thorndike, and Ives-Stilwell experiments. Thus the revised proof is a valid test theory which is independent of any conventions, since one appeals only to the experimental evidence. The analysis of that evidence shows the directions in which efforts to test special relativity should go. Finally it is shown how the resulting test theory still has to be improved for consistency in the analysis of experiments with complicated experimental setups, how it can be simplified for expediency as to what should be tested, and how it should be completed for a missing step not considered by Robertson. (shrink)

It is shown that relativistic spacetimes can be viewed as Finslerian spaces endowed with a positive definite distance (ω0, mod ωi) rather than as pariah, pseudo-Riemannian spaces. Since the pursuit of better implementations of “Euclidicity in the small” advocates absolute parallelism, teleparallel nonlinear Euclidean (i.e., Finslerian) connections are scrutinized. The fact that (ωμ, ω0 i) is the set of horizontal fundamental 1-forms in the Finslerian fibration implies that it can be used in principle for obtainingcompatible new structures. If the connection (...) is teleparallel, a Kaluza-Klein space (KKS) indeed emerges from (ωμ, ω0 i), endowed ab initio with intertwined tangent and cotangent Clifford algebras. A deeper level of Kähler calculus, i.e., the language of Dirac equations, thus emerges. This makes the existance of an intimate relationship between classical differential geometry and quantum theory become ever more plausible. The issue of a geometric canonical Dirac equation is also raised. (shrink)

The observation of ancient cynicism as a philosophical precursor of anarchism has been made by a large number of scholars and specialists in both fields. The following paper aims to bring new insights into the cynicism-anarchism relationship. Our starting point is the figure of the proto-Cynic Diogenes of Sinope [412-402 / 325-321], whose heterodox philosophy, of which we do not preserve writings, has been the object of ambivalent receptions throughout history. We will see why he has been claimed as an (...) illustrious member of the prehistory of anarchism and what new perspectives we can add to these studies. (shrink)

In an accompanying paper (I), it is shown that the basic equations of the theory of Lorentzian connections with teleparallelism (TP) acquire standard forms of physical field equations upon removal of the constraints represented by the Bianchi identities. A classical physical theory results that supersedes general relativity and Maxwell-Lorentz electrodynamics if the connection is viewed as Finslerian. The theory also encompasses a short-range, strong, classical interaction. It has, however, an open end, since the source side of the torsion field equation (...) is not geometric.In this paper, Kaehler's partial geometrization of the Dirac equation is taken as a starting point for the development of fully geometric Dirac equations via the correspondence principle given in I. For this purpose, Kaehler's calculus (where the spinors are differential forms) is generalized so that it also applies when the torsion is not zero. The point is then made that the forms can take values in tangent Clifford algebras rather than in tensor algebras. The basic “Eigenschaft” of the Kaehler calculus also is examined from the physical perspective of dimensional analysis.Geometric Dirac equations of great structural simplicity are finally inferred from the standard Dirac equation by using the aforementioned correspondence principle. The realm of application of the Dirac theory is thus enriched in principle, though only at an abstract level at this point: the standard spinors, which are scalar-valued forms in the Kaehler version of that theory, become Clifford-valued. In addition, the geometrization of the Dirac equation implies a geometrization of the Dirac current. When this current is replaced in the field equations for the torsion, the theory of Paper I becomes fully geometric. (shrink)

Microsystems are described as contexts formed by a subject, their roles, interactions, and a specific physical space and time, such as housing and the school environment. Although several studies suggest the importance of studying this type of environment and its repercussion on children's development, in a Latin American context few studies integrate the interaction of two primary settings in the development of executive functioning. The present study explores the effects of the quality of housing and school environments on the perception (...) of stress, decision making, and planning among children. A total of 114 children (43% girls and 57% boys, Mage = 10.57) from a primary school located in a community classified as poor participated in the study. It was measured: environmental quality of classrooms, housing, stress and executive functioning of children. The results reveal a model linking environmental quality levels in children's homes and schools and executive functioning. We also obtain a mediating role of stress between microsystems and performance, finding a deficit in executive performance when children experienced higher levels of stress as a result of poor environmental quality both in their homes and in their schools. (shrink)

A connection viewed from the perspective of integration has the Bianchi identities as constraints. It is shown that the removal of these constraints admits a natural solution on manifolds endowed with a metric and teleparallelism. In the process, the equations of structure and the Bianchi identities take standard forms of field equations and conservation laws.The Levi-Civita (part of the) connection ends up as the potential for the gravity sector, where the source is geometric and tensorial and contains an explicit gravitational (...) contribution.Nonlinear field equations for the torsion result. In a “low-energy” approximation (linearity andlow energy-momentumtransfer), the postulate that only charge and velocities contribute to the source transforms these equations into the Maxwell system. Moreover, the affine geodesics become the equations of motion of special relativity with Lorentz force in the same approximation [J. G. Vargas,Found. Phys. 21, 379 (1991)]. The field equations for the torsion must then be viewed as applying to an electromagnetic/strong interaction.A classical unified theory thus arises where the underlying geometry confers their contrasting characters to Maxwell-Lorentz electrodynamics and to an Einstein's-like theory of gravity. The highly compact field equations must, however, be developed in phase-spacetime, since the connection is velocity-dependent, i.e., Finsler-like.Further opportunities for similarities with present-day physics are discussed: (a) teleparallelism allows for the formulation of the torsion sector of the theory as a flat space theory with concomitant point-dependent transformations; (b) spinors should replace Lorentz frames in their role as the subjects to which the connection refers; (c) the Dirac equation consistent with the frame bundle for a velocity-dependent metric with Lorentz signature generates a weak-like interaction in the torsion sector. (shrink)

Los objetivos de nuestro estudio se basarán en ahondar en que el verdadero prosumer ha conformado la personificación de la interactividad absoluta en la generación de mensajes, historias o cualquier otro tipo de contenidos. Por tanto, se subraya que no solo es trascendental para la eficacia de una narración la estructura y los ingredientes de ésta, sino también la manera en que se cuenta, el medio utilizado y la plataforma de visualización. También resulta relevante el sentido de la fragmentación de (...) la propia narración para el éxito de su hiperconectividad argumental y emocional. (shrink)

This paper develops the conjecture that the electromagnetic interaction is the manifestation of the torsion Ωμ of spacetime. This conjecture is made feasible by the natural separation of the connection ω μ v into “gravitational” and “electromagnetic” parts α μ v and β μ v , respectively, related to the metric and to the torsion. When α μ v is neglected in front of β μ v , the affine geodesics are shown to become the equations of motion of charged (...) particles with Lorentz force, for an appropriate choice of Ωμ. Since β μ v contains the factor q/m, neutral particles do not see the torsional part of the connection and behave as if Ωμ were zero, i.e., as in Einstein's theory of gravity (the same effect is obviously obtained for charged particles when β μ v 《 α μ v ).In addition to the factor q/m, the velocity of the test particle appears in Ωμ. This indicates that the appropriate context for this problem is to be found in velocity-dependent connections. The velocities are now coordinates and become the actual velocities of the test particles only in the system of equations that one solves for obtaining the affine geodesics in connections of this type.When written with differential forms, the combination of Maxwell's equations and of the pertinent form of the torsion suggests geometric field equations for electrodynamics. As for the gravitational part of the connection, it can be made to obey equations similar in form to the Einstein field equations. A unified geometric theory of electrodynamics and gravitation spontaneously emerges. The present state of the theory does not yet permit us to ascertain whether the right-hand side of the fully geometric, gravitational field equations corresponds to the energy-momentum tensor. (shrink)

In a recent paper [J. G. Vargas and D. G. Torr, Found. Phys. 27, 599 (1997)], we have shown that a subset of the differential invariants that define teleparallel connections in spacetime generates a teleparallel Kaluza-Klein space (KKS) endowed with a very rich Clifford structure. A canonical Dirac equation hidden in this structure might be uncovered with the help of a teleparallel Kähler calculus in KKS. To bridge the gap to such a calculus from the existing Riemannian Kähler calculus (...) in spacetime, we commence the construction of a teleparallel Kähler calculus in spacetime. In the process, we notice: (a) Unknown to him, one of Einstein's equations in his attempt at unification with teleparallelism states that the interior covariant derivative of the torsion is zero. (b) A mechanism exists in the tangent bundle of teleparallel spaces for producing confinement (in the applicable cases, one would have to show why nonconfinement also occurs, rather than the other way around). (c) When the torsion is not zero, the interior covariant derivative in the sense of Kähler, δF, does not coincide with *d*F. The system (dF = 0, δF = j) rather than (dF = 0, *d*F = j) should then be used for generalizations of Maxwell's electrodynamics. (shrink)

We show that in 1929 Cartan and Einstein almost produced a theory in which the electromagnetic (EM) field constitutes the time-like 2-form part of the torsion of Finslerian teleparallel connections on pseudo-Riemannian metrics. The primitive state of the theory of these connections would not, and did not, permit Cartan and Einstein to realize how their torsion field equations contained the Maxwell system and how the Finslerian torsion contains the EM field. Cartan and Einstein discussed curvature field equations, though failing to (...) focus on the fact that teleparallelism automatically implies gravitational field equations with torsion terms as source, both in first and second order. We further show that the first-order contribution of the EM field to the source of the gravitational field may play havoc with the remeasurement of Newton's gravitational constant, even if the experiment is electrically grounded. These results are also used as support for the thesis that there is an alternative to the present way of dealing with the great theoretical questions of physics. On the practical side, the inconveniences faced in measuring G may be greatly compensated by the possibility of manipulating spacetime with electric fields at the first-order level. (shrink)

Most Latin American scholars treat Latin American nations as a simple study object with similar characteristics. The purpose of this essay is to analyze some myths, stereotypes, realities, and challenges given to one of the most important regions of the world, knowing as Latin America. Latin Americ..

En este artículo realizamos una aproximación investigativa-teórico-reflexiva sobre los efectos del postmodernismo y la postmodernidad en la sociedad actual y en el ámbito educativo en particular (centrándonos en el papel del maestro/profesor). Bajo la apariencia del bien común: mayor igualdad, ecologismo, atención a la diversidad, respeto a las diferencias…, una de las visiones del postmodernismo lo convierte en el chivo expiatorio del capitalismo, propiciando que este siga fagocitándose, generando de manera implícita una visión unívoca y poco propiciadora de críticas por (...) parte del grueso de la sociedad, que la acepta como parte de ese bien común. Ante esto ¿qué podemos hacer desde nuestro papel educativo? (shrink)

El autor señala que la ola democratizadora de las últimas décadas requiere la precisión conceptual de gobernabilidad local, para lo que desarrolla una reflexión sobre la gobernabilidad económica glocal, la gobernancia local, y la gobernabilidad democrática de los gobiernos locales. Concluye argumentando que el Estado de Derecho, el fortalecimiento de la sociedad civil y el desarrollo de la capacidad de gobernabilidad contribuyen a la ampliación y profundización del espacio público y al establecimiento de mecanismos de control social sobre los recursos (...) públicos, por lo que la discusión de la democracia postnacional compete al conjunto de los ciudadanos. (shrink)

The kinematic aspects of the rocket-borne clock experiment by Vessot and Levine are analyzed with the revised Robertson's test theory of special relativity (Found. Phys. 14, 625 (1984)). Besides the expected time-dilation, it is found that the intermediate steps of this experiment yield in principle Michelson-Morley type information (a relation between longitudinal and transverse length contractions) in the third order of the velocities involved, but no relativity-of-simultaneity related effects.The flat space-time test theory induces a family of “spherically symmetric” line elements (...) that become the Schwarzschild line element in the relativistic case and also in theabinito rest frame of the theory. These line elements represent the same space-time manifold, but pertain in a one-to-one correspondence to the different flat space-time coordinate transformations of the test theory. The conserved energy is related to the family of local energies in the tangent plane. No deviations from the orthodoxy appear at the pertinent levels of approximation. Hence the unexplained residuals of the Vessot-Levine experiment are not due in obvious ways to kinematic and gravitational frequency shifts caused by deviations of the “real” coordinate transformations from the Lorentz transformations. (shrink)

The electrodynamics consistent with the para-Lorentzian mechanics developed in previous papers is obtained. The transformation law for the fields, Maxwell's equations, and the potentials are the main topics considered. One then obtains the gauge transformation and the electromagnetic action with a view to further develop the para-Lorentzian theory of the electron.

Este trabajo tiene como objetivo analizar las perspectivas teórico-metodológicas del posmodernismo como tendencia de la política comparativa. A pesar de que los posmodernistas frecuentemente rechazan algunos de los puntos del acercamiento conductual, la psicología política tiende a abarcarlos. En este análisis se sugiere que se debe tener cuidado cuando se atribuyen elementos al posmodernismo ya que está lejos de ser una disciplina monolítica, pues contiene diferentes áreas de interés, tales como el posestructuralismo. La posmodernidad cuestiona la legitimidad del desarrollo alcanzado (...) por la modernidad y la universalidad de sus valores y procesos, el reduccionismo economicista, su enfoque etnocéntrico y la unidimensionalidad de su interpretación. (shrink)

The issue of whether teleparallel nonlinear connections exist is resolved by their explicit construction on Finslerian metrics that arise in the Robertson test theory of special relativity (RTTSR), and on the Minkowski metric in particular. The method is an adaptation to the Finsler bundle of a similar construction for teleparallel linear connections. It suggests the existence of a concept of metric compatibility alternative toω μλ +ω λμ = 0 for teleparallel nonlinear connections. A sophisticated system of partial differential equations whose (...) solutions have been discussed in the computing literature is interpreted in geometric terms. The characteristics of the solutions are checked against compliance with the conditionω μλ +ω λμ = 0, an issue whose relevance for this theory derives from the fact that nonantisymmetric connections repeatedly appear in teleparallel geometry. (shrink)

In 1960–1962, E. Kähler enriched É. Cartan’s exterior calculus, making it suitable for quantum mechanics (QM) and not only classical physics. His “Kähler-Dirac” (KD) equation reproduces the fine structure of the hydrogen atom. Its positron solutions correspond to the same sign of the energy as electrons.The Cartan-Kähler view of some basic concepts of differential geometry is presented, as it explains why the components of Kähler’s tensor-valued differential forms have three series of indices. We demonstrate the power of his calculus by (...) developing for the electron’s and positron’s large components their standard Hamiltonian beyond the Pauli approximation, but without resort to Foldy-Wouthuysen transformations or ad hoc alternatives (positrons are not identified with small components in K ähler’s work). The emergence of negative energies for positrons in the Dirac theory is interpreted from the perspective of the KD equation. Hamiltonians in closed form (i.e. exact through a finite number of terms) are obtained for both large and small components when the potential is time-independent.A new but as yet modest new interpretation of QM starts to emerge from that calculus’ peculiarities, which are present even when the input differential form in the Kähler equation is scalar-valued. Examples are the presence of an extra spin term, the greater number of components of “wave functions” and the non-association of small components with antiparticles. Contact with geometry is made through a Kähler type equation pertaining to Clifford-valued differential forms. (shrink)

This article presents the results of the evaluations of the mechanical stresses associated with the performance of manual lifting tasks of loads and those operators must endure in their workplaces, considering these the most recurrent cases and positions. This study is based on a static analysis of certainspecific positions of the human body, the transmission of forces through the musculoskeletal structure, and the generation of efforts at critical points of the body. In addition to this, it is considered a revision (...) of the criteria of the Spanish Technical Standard NTP-477. There are critical points of the musculoskeletal structure that support considerable efforts, the recommendations and criteria provided by the NTP-477 are relevant and although limited, provide an adequate margin of safety to avoid injury to workers. (shrink)

The large number of sensors and actuators that make up the Internet of Things obliges these systems to use diverse technologies and protocols. This means that IoT networks are more heterogeneous than traditional networks. This gives rise to new challenges in cybersecurity to protect these systems and devices which are characterized by being connected continuously to the Internet. Intrusion detection systems are used to protect IoT systems from the various anomalies and attacks at the network level. Intrusion Detection Systems can (...) be improved through machine learning techniques. Our work focuses on creating classification models that can feed an IDS using a dataset containing frames under attacks of an IoT system that uses the MQTT protocol. We have addressed two types of method for classifying the attacks, ensemble methods and deep learning models, more specifically recurrent networks with very satisfactory results. (shrink)

In this research, a sliding mode regulator with sine mapping is suggested for the stabilization of electricity generators being affected by magnet interaction nonlinearities and generator nonlinearities. To reach this goal, our suggested regulator has the following contributions: it starts from the sliding mode regulator with the modifications that the saturation mapping is used to reach a smoother performance instead of the signum mapping, and the sine mapping is applied to reach an upper bound in the proportional gain error, it (...) is used to reach some chosen constant behaviors for the angle position, angle speed, and current in the electricity generators, and its stabilization is ensured based on the Lyapunov approach. We show the simulation of the suggested regulator in two electricity generators. (shrink)

The revised Robertson's test theory of special relativity (SR) has been constructed upon a family of sets of passive coordinate transformations in flat space-time [J. G. Vargas and D. G. Torr,Found. Phys., 16, 1089 (1986)]. In the same paper, it has also been shown that the boosts depend in general on the velocities of the two frames involved and not only on their relative velocity. The only exception to this is SR, if one has previously used an appropriate constraint (...) to remove the other relativities—like Galilean relativity—from the family.In this paper we look at these coordinate transformations in the only way there is to do so, namely as transformations in a seven-dimensional “Cartan Space” (Cartan first considered this in his dealings with Newtonian kinematics). In this space, the boosts only depend on the relative velocity of the frames. The passive coordinate transformations in each set are shown to have a nonlinear group structure isomorphic to that of the Poincaré group.The existence of a preferred frame, except in SR, makes the active transformations inequivalent to the passive ones. It is shown that the composite active-passive transformations act on a ten-dimensional space and that each member set of the family also has a group structure. As a result, one ends up with a family of mutually isomorphic 9-parameter (homogeneous) supergroups and a family of mutually isomorphic (9 + 4)-parameter (inhomogeneous) supergroups. The presence of extra parameters could be looked upon as “internal” degrees of freedom, which are, however, an offshoot of the Robertson space-time. (shrink)

The experimental testing of the Lorentz transformations is based on a family of sets of coordinate transformations that do not comply in general with the principle of equivalence of the inertial frames. The Lorentz and Galilean sets of transformations are the only member sets of the family that satisfy this principle. In the neighborhood of regular points of space-time, all members in the family are assumed to comply with local homogeneity of space-time and isotropy of space in at least one (...) free-falling elevator, to be denoted as Robertson'sab initio rest frame [H. P. Robertson,Rev. Mod. Phys. 21, 378 (1949)].Without any further assumptions, it is shown that Robertson's rest frame becomes a preferred frame for all member sets of the Robertson family except for, again, Galilean and Einstein's relativities. If one now assumes the validity of Maxwell-Lorentz electrodynamics in the preferred frame, a different electrodynamics spontaneously emerges for each set of transformations. The flat space-time of relativity retains its relevance, which permits an obvious generalization, in a Robertson context, of Dirac's theory of the electron and Einstein's gravitation. The family of theories thus obtained constitutes a covering theory of relativistic physics.A technique is developed to move back and forth between Einstein's relativity and the different members of the family of theories. It permits great simplifications in the analysis of relativistic experiments with relevant “Robertson's subfamilies.” It is shown how to adapt the Clifford algebra version of standard physics for use with the covering theory and, in particular, with the covering Dirac theory. (shrink)

The assembly of products or components by operators in industries is a complex task with recurring problems. In these processes, operators often make errors that can lead to defective products. Therefore, they need to be inspected later to verify their correct assembly. The main problems are caused by several reasons including high employee turnover, lack of experience in manufacturing specific products or confusion in interpreting instructions to assemble similar components. In this paper, a novel structured language aimed to describe the (...) required actions to manufacture a product in industrial assembly environments is presented. The main contribution is to provide a formal language to feed automatic systems that can verify through visual control whether the actions performed by the operator are carried out following the standard described by this language. In general, the use of this formal language will allow to minimize the negative impact of errors during assembly and to reduce waste in many forms in the industry. (shrink)

It has recently been shown by Vargas, (4) that the passive coordinate transformations that enter the Robertson test theory of special relativity have to be considered as coordinate transformations in a seven-dimensional space with degenerate metric. It has also been shown by Vargas that the corresponding active coordinate transformations are not equal in general to the passive ones and that the composite active-passive transformations act on a space whose number of dimensions is ten (one-particle case) or larger (more (...) than one particle).In this paper, two different (families of) electrodynamics are constructed in ten-dimensional space upon the coordinate free form of the Maxwell and Lorentz equations. The two possibilities arise from the two different assumptions that one can naturally make with respect to the acceleration fields of charges, when these fields are related to their relativistic counterparts. Both theories present unattractive features, which indicates that the Maxwell-Lorentz framework is unsuitable for the construction of an electrodynamics for the Robertson test theory of the Lorentz transformations. It is argued that this construction would first require the formulation of Maxwell-Lorentz electrodynamics in the form of a connection in Finsler space. If such formulation is possible, the sought generalization would consist in simply changing bases in the tangent spaces of the manifold that supports the connection. In addition, the number of dimensions of the space of the Robertson transformations would be ten, but not greater than ten. (shrink)

Cavalleri and Spinelli have criticized previous work, connected with synchronization procedures, by the present author. This reply discusses their criticisms.

Aim: The presence of noise in urban environments is rarely considered a factor that causes damage to the environment. The primary generating source is transportation means, with vehicles being the ones that affect cities the most. Traffic noise has a particular influence on the quality of life of those who are exposed to it and can cause health alterations ranging from annoyance to cardiovascular diseases. This study aims to describe the relationship between the traffic noise level and the perceived annoyance (...) in the inhabitants of a city on the Northern Border of Mexico. The work carried out in a city represents the vulnerability characteristics: economic, social, and migratory of its sizable portion of the inhabitants. Due to that, it is impossible to identify precisely the number of residents as the number of vehicles in circulation.Methods: The streets and avenues with an annual average daily traffic of more than 1,000 vehicles were considered for the measurement of traffic noise. The equipment used was a vehicle gauge with non-invasive speed radar; type I integrating sound level meters, with their respective gauges and tripods. A questionnaire was applied to people living within 250 m of the streets and avenues in which the noise was measured.Results: The noise measurement found a parameter of LAeq estimated for 12 h during the day, exceeding 70 dBA. The data received from the questionnaire were statistically tested by using Pearson's correlation tests. A total number of 2,350 people were participated, of whom 1,378 were women and 972 were men. The age of participants is ranged from 18 to 75 years. The overall perception of traffic noise annoyance identified that 1,131 participants responded “Yes” as they considered the noise annoying. Participants who responded “No” as well as those who responded “Do not know” resulted in a total of 1,219 people.Conclusion: The results show that the population is desensitized to traffic noise and does not perceive it as an annoyance. The flow of vehicles and the type of vehicles are the significant factors for the propagation and increase in the traffic noise levels. Women present a considerable appreciation of traffic noise perception instead of younger people who demonstrate a higher tolerance to high-level exposure. This reflects the lack of information of the population around the noise problem and its effects. (shrink)

CONTENIDO: Pensar temáticamente la filosofía - Nosotros y la filosofía - El método en la construcción del discurso filosófico - El mundo circundante: estudio sobre la conciencia, la toma de conciencia y la realización de la conciencia - El puesto de la estética en la filosofía - Sobre el concepto de naturaleza en empédocles - La pregunta por la técnica en serenidad de M. Heidegger - Cuatro paradojas en el proyecto de la filosofía latinoamericana - La secularización de la cultura: (...) una exigencia para la modernidad - El concepto de imagen y de política en paradiso de José Lezama Lima. (shrink)

En sus Apologías y discursos de las conquistas occidentales, Bernardo de Vargas Machuca, apoyándose en Juan Ginés de Sepúlveda, pretende justificar el dominio español americano. En sus planteamientos es posible constatar un cambio de la noción de bárbaro, que se puede interpretar como una ampliación del concepto de siervo por naturaleza, a partir de la caracterización del indio como alguien ya sometido pero que, de una u otra manera, trata de resistirse a un dominio impuesto y no querido. Así, (...) las ideas de Vargas Machuca al respecto se pueden entender como un aporte para la comprensión filosófica de la construcción de la imagen tanto del indio como del indiano por el tiempo del inicio de la Colonia. Resumen En sus Apologías y discursos de las conquistas occidentales , Bernardo de Vargas Machuca, apoyándose en Juan Ginés de Sepúlveda, pretende justificar el dominio español americano. En sus planteamientos es posible constatar un cambio de la noción de bárbaro, que se puede interpretar como una ampliación del concepto de siervo por naturaleza, a partir de la caracterización del indio como alguien ya sometido pero que, de una u otra manera, trata de resistirse a un dominio impuesto y no querido. Así, las ideas de Vargas Machuca al respecto se pueden entender como un aporte para la comprensión filosófica de la construcción de la imagen tanto del indio como del indiano por el tiempo del inicio de la Colonia.In its Apologías y discursos de las conquistas occidentales , Bernardo de Vargas Machuca pretends to justify the Spanish dominion on America taking support on Juan Ginés de Sepúlveda. In its account it is possible to note a change in the notion of a Barbarian, which can be interpreted as an extension of the concept of “slavery by nature”. From this point of view the Indian is conceived as someone who is submitted but who nevertheless tries to resist to an unwilled and imposed domination. Thus Vargas Machuca claims on this matter can be understood as a contribution to the philosophical understanding of the conception, during the Colonial time, of the Indian as well as of the indiano. (shrink)

This article inquires whether or not religious beliefs are rational, that is to say, whether or not they can be rationally sustained. The point of the article is not to prove the existence of God, but rather simply to show whether or not religious language has real meaning. To do this, we shall examine the concept of belief in general. Then we shall look at religious beliefs in particular from two opposing points of view: on the one hand, from the (...) position of authors who claim that religious beliefs can in fact be sustained by rational evidence, and on the other hand, from the perspective of other authors who affirm that these beliefs cannot be rationally justified, because spiritual discourse refers to the ineffable, which deprives it of the means to verify or deny its propositions. (shrink)

En forma de síntesis reflexiva sobre la vida y la obra de Adolfo Sánchez Vázquez, el trabajo responde in inicialmente a una solicitud de la revista Casa de las Américas. Esta revista-institución había pedido, en justo homenaje a este genuino marxista, un comentario a dos volúmenes que celebraban desde México, con inteligente selección, abierta a la controversia, su 80 aniversario (1995). Se trataba de los libros Adolfo Sánchez Vázquez: los trabajos y los días y En torno a la obra de (...) Adolfo Sánchez Vázquez, editados por Federico Álvarez y Gabriel Vargas Lozano, respectivamente. Publicado originalmente con el título “La empecinada herejía de Adolfo Sánchez Vázquez” en la mencionada revista (núm. 203, La Habana,1996, pp.142-147), el texto fue revisado y actualizado para la presente edición. (shrink)

En 1561 la Hermandad Sacramental del Sagrario de la catedral de Sevilla solicita a los calonges se exorne la pared de su capilla en las gradas por lo que el cabildo encarga al pintor Luis de Vargas realice una pintura mural de Jesús camino de la amargura. La obra es estrenada en 1563 y en ella se representa al Redentor ataviado con túnica blanca de igual modo que los condenados que por allí pasaban camino del patíbulo y portando la (...) cruz al revés. El llamado popularmente “Cristo de los Ajusticiados” es un claro exponente de un retablo callejero que tanta devoción popular manifestó en la España de la Edad Moderna. (shrink)

Entre 1822 et 1824, Micaela Mutis, nièce de Don José Celestino Mutis, mène une intense bataille juridique contre son mari pour obtenir la garde de son enfant illégitime et revendiquer ses droits de citoyenne dans la nouvelle République de Colombie ; paradoxalement, elle est condamnée par le nouvel État en vertu des lois de l’Empire espagnol récemment abandonné. Ce cas, découvert et analysé par l’historienne Aída Martínez Carreño, souligne la nécessité de réinterpréter le rôle des femmes dans l’historiographie colombienne ainsi (...) que la relation entre la vie privée et la vie publique et politique de nombre d’entre elles, qui ont été encouragées à devenir citoyennes grâce à leur engagement pour la cause patriotique. Ces dernières années, des chercheuses tels que Judith González et Martha Lux ont contribué à l’histoire des femmes en Colombie avec des résultats qui discutent et démontrent une fois de plus que le rôle joué par les femmes à cette époque est loin du rôle passif que l’historiographie traditionnelle, majoritairement masculine, leur avait accordé. (shrink)

El texto constituye una reseña-comentario a dos volúmenes que celebraban desde México, con inteligente selección, abierta a la controversia, el 80 aniversario (1995) del destacado pensador hispano-mexicano. Se trataba de los libros Adolfo Sánchez Vázquez: los trabajos y los días y En torno a la obra de Adolfo Sánchez Vázquez, editados por Federico Álvarez y Gabriel Vargas Lozano, respectivamente. El título del comentario hace alusión a la permanente actitud de principios de Sánchez Vázquez, quien mantuvo, primero, una actitud crítica (...) ante el marxismo ortodoxo y dogmático que se difundía desde la URSS y el llamado socialismo real y, después, asumió estoicamente la defensa del marxismo cuando aquellos habían desaparecido. (shrink)

La sociedad atraviesa una serie de transformaciones en sus relaciones entre instituciones y comunidad; en este marco la universidad, desde su misión académica centrada en la formación e investigación para el desarrollo de conocimientos, está promoviendo una mayor implicación hacia las necesidades de la sociedad, a lo que se denomina responsabilidad social universitaria (RSU). Este artículo presenta cómo, desde una perspectiva humanista, se constituye una comunidad social de investigación entre la Unidad de Investigación Enfoque Centrado en la Persona de la (...) Universidad de Valencia –España-, el grupo Prisma de la Universidad Autónoma de Bucaramanga –Colombia- y la Fundación Albeiro Vargas (FAVAC) –Colombia- cuya finalidad es la atención al adulto mayor. Mediante una metodología de investigación-acción participativa, se genera una base de cooperación institucional para la promoción del bienestar psicológico del adulto mayor. El voluntariado, a través de sus docentes y sus alumnos, se concreta así en una acción de responsabilidad social universitaria cuya primera actividad es la valoración del bienestar psicológico del adulto mayor en la fundación Albeiro Vargas. (shrink)

A new chronology is introduced to address the history of chemistry, with educational purposes, particularly for the end of the twentieth century and here identified as the fifth chemical revolution. Each revolution are considered in terms of the Kuhnian notion of ‘exemplar,’ rather than ‘paradigm.’ This approach enables the incorporation of instruments, as well as concepts and the rise of new subdisciplines into the revolutionary process and provides a more adequate representation of such periods of development and consolidation. The fifth (...) revolution developed from 1973 to 1999 and is characterized by a deep transformation in the very heart of chemistry. That is to say, the size and type of objects, the way in which they must be done and the time in which they are transformed. In one way or another, chemistry’ limits had been set out. (shrink)