In this paper we study in details a system of two weakly coupled harmonic oscillators from the point of view of Bohm’s interpretation of quantum mechanics. This system may be viewed as a simple model for the interaction between a photon and a photodetector. We obtain exact solutions for the general case. We then compute approximate solutions for the case where one oscillator is initially in its first excited state (a single photon) reaching the other oscillator in its ground state (...) (the photodetector). The approximate solutions represent the state of both oscillators after the interaction, which is not an eigenstate of the individual hamiltonians for each oscillator, and therefore the energies for each oscillator do not exist in the Copenhagen interpretation of Quantum Mechanics. We use the approximate solutions that we obtained to compute Bohmian trajectories and to study the energy transfer between the oscillators. We conclude that, even using the Bohmian view, the energy of each individual oscillator is not well defined, as the nonlocal quantum potential is not negligible even after the coupling is turned off. (shrink)

Polyclonal antibodies raised against the human erythrocyte nucleoside transporter were used to investigate the distribution of the nucleoside transporters in the placenta. Immunoblots of brush-border membranes isolated from the human syncytiotrophoblast revealed a cross-reactive species that co-migrated with the erythrocyte nucleoside transporter as a broad band of apparent M(r) 55,000. In contrast, no labelling was detected in basal membranes containing a similar number of equilibrative nucleoside transporters as assessed by nitrobenzylthioinosine (NBMPR)-binding. The absence of cross-reactive epitopes in basal membranes and (...) their presence in brush-border membranes was confirmed by confocal immunofluorescence microscopy. The results suggest that at least two isoforms of the NBMPR-sensitive nucleoside transporter are present in the human placenta. The lumenal surfaces of fetal capillaries, small placental vessels and umbilical vein ware also strongly labelled by the antibody, a finding that suggests that the high fetal-placental adenosine uptake previously reported is due to endothelial transporters. (shrink)

Contrary to the predominant way of doing physics, we claim that the geometrical structure of a general differentiable space-time manifold can be determined from purely dynamical considerations. Anyn-dimensional manifoldV a has associated with it a symplectic structure given by the2n numbersp andx of the2n-dimensional cotangent fiber bundle TVn. Hence, one is led, in a natural way, to the Hamiltonian description of dynamics, constructed in terms of the covariant momentump (a dynamical quantity) and of the contravariant position vectorx (a geometrical quantity). (...) That is, the Hamiltonian description furnishes a natural way of relating dynamics and geometry. Thus, starting from the Hamiltonian state function (for a particle)—taken as the fundamental dynamical entity—we show that general relativistic physics implies a general pseudo-Riemannian geometry, whereas the physics of the special theory of relativity is tied up with Minkowski space-time, and nonrelativistic dynamics is bound up to Newton-Cartan space-time. (shrink)

We first show that a theorem by Cartan that generalizes the Frobenius integrability theorem allows us (given certain conditions) to obtain noncurvature solutions for the differential Bianchi conditions and for higher-degree similar relations. We then prove that there is no algorithmic procedure to determine, for a reasonable restricted algebra of functions on spacetime, whether a given connection form satisfies the preceding conditions. A parallel result gives a version of Gödel's first incompleteness theorem within an (axiomatized) theory of gauge fields.

Expediente - Horizonte, Belo Horizonte, v. 20, n. 61, jan./abr. 2022.

The present paper aims at investigating the meaning and scope of the idea of musical dissonance in The Birth of Tragedy. In reviewing the possible explanatory definitions of this concept, within and outside the speculative-theoretical framework proper to Nietzsche’s first book, we hope to open a path that leads us to rethink the so-called “artist metaphysics”, and, specially, what is generally understood as Dionysian music.

The US neutrino community gathered at the Workshop on the Intermediate Neutrino Program at Brookhaven National Laboratory February 4-6, 2015 to explore opportunities in neutrino physics over the next five to ten years. Scientists from particle, astroparticle and nuclear physics participated in the workshop. The workshop examined promising opportunities for neutrino physics in the intermediate term, including possible new small to mid-scale experiments, US contributions to large experiments, upgrades to existing experiments, R&D plans and theory. The workshop was organized into (...) two sets of parallel working group sessions, divided by physics topics and technology. Physics working groups covered topics on Sterile Neutrinos, Neutrino Mixing, Neutrino Interactions, Neutrino Properties and Astrophysical Neutrinos. Technology sessions were organized into Theory, Short-Baseline Accelerator Neutrinos, Reactor Neutrinos, Detector R&D and Source, Cyclotron and Meson Decay at Rest sessions.This report summarizes discussion and conclusions from the workshop. (shrink)

RESUMEN: Primo Levi fue un químico y escritor italiano judío que sobrevivió a Auschwitz III (Monowitz) y dejó su testimonio en Se questo è un uomo (1947), La tregua (1963), Il sistema periodico (1975), I sommersi e i salvati y otros escritos y entrevistas. La voz de Levi es la voz de la conciencia moral, el testimonio de la barbarie y la memoria de las víctimas (una voz que habla de deportación, injusticia, hundimiento y destrucción). En el presente artículo trazo (...) un pequeño recorrido biográfico enmarcado en el terrible escenario de la Shoah (enfatizando que Levi no se suicidó), desmenuzo el gigantesco complejo de Auschwitz (sus tres campos principales y sus 44/45 subcampos) (cuya realidad a menudo se mezcla y se confunde), diferenciando, para mayor claridad, los campos de exterminio (Vernichtungstlager, VL –también, Totenlager) de los campos de concentración (Konzentrationslager, KZ), describo el testimonio de Levi como memoria y conciencia moral, examino su concepto de supervivencia y dignidad, y analizo las tesis de Levi sobre la ausencia de Dios en Monowitz y el sinsentido del sufrimiento de las víctimas en el KZ. /// ABSTRACT: Primo Levi was a Jewish Italian chemist and writer who survived Auschwitz III (Monowitz) and left his testimony in Se questo è un uomo (1947), La tregua (1963), Il sistema periodico (1975), I sommersi e i salvati and other writings and interviews. Levi's voice is the voice of moral conscience, testimony of atrocity and memory of the victims (a voice that speaks of deportation, injustice, collapse and destruction). In the present paper, I present a short biographical note within the framework of the Holocaust (emphasizing that Levi did not commit suicide), I break down the gigantic Auschwitz complex (its three main camps and its 44/45 subcamps) (whose reality is often mixed and confused), differentiating, for the sake of clarity, the extermination camps (Vernichtungstlager, VL –also, Totenlager) from the concentration camps (Konzentrationslager, KZ), I describe Levi's testimony as memory and moral conscience, I examine his concept of survival and dignity, and I analyze Levi's theses about the absence of God in Monowitz and the meaninglessness of the victims' suffering in the KZ. (shrink)

RESUMEN: Frankl abre una puerta a la esperanza con la dimensión suprahumana, define la religión como la búsqueda del sentido último y apuesta por una fe incondicional que otorga sentido al sufrimiento de las víctimas. Unamuno, angustiado y sufriente, se bate con su fe (una fe dubitativa –la duda, aunque se transforme en agonía, es crucial para Unamuno). Unamuno cree porque anhela creer (por necesidad); Frankl cree existencialmente (por de- cisión). En este artículo expongo los diferentes acercamientos de Frankl y (...) Unamuno a la fe (exponiendo también las tesis de otros filósofos, teólogos y supervivientes de la Shoah) y muestro cómo estas aproximaciones abren una puerta a la esperanza (y al sentido del sufrimiento de las víctimas de la Shoah). / Palabras clave: dimensión suprahumana, escatología, esperanza, fe dubitativa, fe in- condicional, Holocausto, inmortalidad, Shoah, sufrimiento de las víctimas, Unamuno, Viktor Frankl. /// ABSTRACT: Frankl opens a door to hope with the suprahuman dimension, defines religion as the search for an ultimate meaning and has an uncoditional faith that gives meaning to the victims' suffering. Unamuno, anguished and suffering, struggles with his faith (a faith which is a doubting faith –doubt, even if it turns into agony, is crucial for Unamuno). Unamuno believes because he longs to believe (out of necessity); Frankl believes existen- tially (out of decision). In this paper, I discuss Frankl's and Unamuno's different ap- proaches to faith (presenting theses of other philosophers, theologians and Shoah survivors as well), showing how these approaches open a door to hope (and to the meaning of the suffering of the victims of the Shoah). / Keywords: doubting faith, eschatology, Holocaust, hope, immortality, Shoah, supra- human dimension, Unamuno, unconditional faith, victims' suffering, Viktor Frankl. (shrink)

AimThe aim of our study was to analyze physical activity levels, sitting time, physical fitness, and their relationship with depressive symptoms after home confinement in previously active older adults.MethodsThis cross-sectional study sample comprised 68 older adults from a community-based exercise program conducted in Porto, Portugal. After home confinement, participants were assessed in person for lower-body strength, cardiorespiratory fitness, agility/dynamic balance, handgrip strength, and anthropometry. Telephone interviews were performed to evaluate depressive symptoms with the Geriatric Depression Scale – 15 items and (...) physical activity levels through the International Physical Activity Questionnaire. Individuals were also asked to self-report changes in their physical activity levels and time spent sitting.ResultsNinety percent of older adults self-reported a decrease in overall physical activity levels, and nearly 65% increased daily sitting time during the home confinement. However, previously active older adults still presented high levels of physical fitness after 11 weeks of home confinement. Overall, 52.9% of participants scored 5 or more points on GDS-15, which is suggestive of depression. Higher levels of moderate-to-vigorous physical activity and cardiorespiratory fitness were found in the non-depressed group compared with the depressed group. Finally, results from multiple regression analysis revealed that MVPA was negatively associated with depression. This model explained 16.4% of the variability seen in depression score, controlled for age, gender, and education.ConclusionEven reporting a decline in physical activity, older adults who previously participated in a formal exercise program, still presented high levels of physical fitness after 11 weeks of home confinement. However, MVPA, but not physical fitness, seems to be an associated depression score in previously active older adults. These results reinforce the importance of older adults to remain physically active, since higher levels of MVPA may have a protective effect on depressive symptoms and, therefore, mitigate the negative impact of home confinement on mental health. Future longitudinal research studies are needed to ascertain these results. (shrink)

Le président Brésilien Luiz Ignacio Lula da Silva a assis son pouvoir sur sa personnalité et des origines populaires qui rompent toute idée de compromission avec les élites. Mais si sa personnalité lui permet de ne pas être une émmanation de son parti , il n'en est pas moins dépendant, pour l'entretien de son image, de celui-ci et des luttes opaques qui s'y déroulent .Brazilian President Luiz Inacio Lula da Silva has based its power on his personality and popular origins (...) that break any idea of ​​compromise with elites. But if his personality can not be a émmanation his party , it is no less dependent for the maintenance of its image, one opaque and struggles taking place. (shrink)

A Trifuncionalidade como Ideologia O estudo das ideologias, no âmbito da História das Idéias, tem gerado algumas das temáticas mais importantes e polêmicas da historiografia das últi­mas décadas, sendo estas particularmente significativas para a compreensão das relações entre representações sociais e Política nos vários períodos históri­cos. Neste ensaio, que examinará a clássica discussão historiográfica sobre a 'trifuncionalidade medieval', estaremos considerando "ideologia" como uma n...

Tradução do Artigo de William James:_ A Suggestion about mysticism_. Texto publicado originalmente em 17 de fevereiro de 1910 no Volume VII N°4 em _The journal of philosophy psychology and scientific methods_ p. 85 a 92. Artigo de domínio público de acordo com a Convenção de Berna.

Aproximación al pensamiento de Rodolfo Kusch -- Canto e identidad en el Martín Fierro según Carlos Astrada y Rodolfo Kusch -- Donde el barro se subleva -- La rehabilitación del saber seminal como camino hacia una mística popular -- Kusch y el impulso social de nuestra época -- La barbarización de la civilización, una grieta de antaño -- ¿De dónde pensarnos?

TOMITA, Luiza E.; BARROS, Marcelo; VIGIL, José Maria (Org.). Pluralismo e libertação. Por uma teologia latino-americana pluralista a partir da fé cristã DAMEN, Franz et al. Pelos muitos caminhos de Deus . Desafios do pluralismo religioso à Teologia da Libertação. Paulo Agostinho Nogueira Baptista KOSCHORKE, Klaus (Hg.). Transkontinentale beziehungen in der geschichte des außereuropäischen christentums/transcontinental links in the History of non-western christianity. Vinicius Mariano de Carvalho.

Double Deception: Stalin, Hitler, and the Invasion of Russia. By James Barros and Richard Gregor (DeKalb IL: Northern Illinois University Press, 1995) xi + 307 pp. cloth, n.p.g.

On the importance of good deeds in Islam.