Results for 'de Helmholtz L'équation'

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  1. F. cap.Nouvelle Méthode de Résolution de, de Helmholtz L'équation & Pour Une Symétrie Cylindrique - 1968 - In Jean-Louis Destouches & Evert Willem Beth (eds.), Logic and foundations of science. Dordrecht,: D. Reidel.
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  2.  41
    How Much Time Does a Measurement Take?Carlos Alexandre Brasil, L. A. de Castro & R. D. J. Napolitano - 2013 - Foundations of Physics 43 (5):642-655.
    We consider the problem of measurement using the Lindblad equation, which allows the introduction of time in the interaction between the measured system and the measurement apparatus. We use analytic results, valid for weak system-environment coupling, obtained for a two-level system in contact with a measurer (Markovian interaction) and a thermal bath (non-Markovian interaction), where the measured observable may or may not commute with the system-environment interaction. Analysing the behavior of the coherence, which tends to a value asymptotically close to (...)
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  3.  42
    Spontaneously Emitted X-rays: An Experimental Signature of the Dynamical Reduction Models.C. Curceanu, S. Bartalucci, A. Bassi, M. Bazzi, S. Bertolucci, C. Berucci, A. M. Bragadireanu, M. Cargnelli, A. Clozza, L. De Paolis, S. Di Matteo, S. Donadi, A. D’Uffizi, J. -P. Egger, C. Guaraldo, M. Iliescu, T. Ishiwatari, M. Laubenstein, J. Marton, E. Milotti, A. Pichler, D. Pietreanu, K. Piscicchia, T. Ponta, E. Sbardella, A. Scordo, H. Shi, D. L. Sirghi, F. Sirghi, L. Sperandio, O. Vazquez Doce & J. Zmeskal - 2016 - Foundations of Physics 46 (3):263-268.
    We present the idea of searching for X-rays as a signature of the mechanism inducing the spontaneous collapse of the wave function. Such a signal is predicted by the continuous spontaneous localization theories, which are solving the “measurement problem” by modifying the Schrödinger equation. We will show some encouraging preliminary results and discuss future plans and strategy.
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  4.  31
    The Foundations of Linear Stochastic Electrodynamics.L. De la Peña & A. M. Cetto - 2006 - Foundations of Physics 36 (3):350-368.
    An analysis is briefly presented of the possible causes of the failure of stochastic electrodynamics (SED) when applied to systems with nonlinear forces, on the basis that the main principles of the theory are correct. In light of this analysis, an alternative approach to the theory is discussed, whose postulates allow to establish contact with quantum mechanics in a natural way. The ensuing theory, linear SED, confirms the essential role of the vacuum–particle interaction as the source of quantum phenomena.
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  5.  3
    Du rapport des sciences de la nature à l’ensemble de la science.Hermann von Helmholtz - 2024 - Philosophia Scientiae 28:19-38.
    Discours prononcé par Helmholtz en 1862 pour la prise de fonction de prorecteur à l’université de Heidelberg. Le texte original de référence est : Hermann von Helmholtz, « Über das Verhältnis der Naturwissenschaften zur Gesammtheit der Wissenschaft » (1862), in _Philosophische und populärwissenschaftliche Schriften_, 3 vol., Michael Heidelberger, Helmut Pulte und Gregor Schiemann (éds.), Hamburg : Felix Meiner Verlag, 2017, vol. 1, p. 181–207. Nous indiquons entre crochets dans la marge la pagination allemande de cette édition (NdT).
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  6.  69
    Quantum Theory and Linear Stochastic Electrodynamics.L. De la Peña & A. M. Cetto - 2001 - Foundations of Physics 31 (12):1703-1731.
    We discuss the main results of Linear Stochastic Electrodynamics, starting from a reformulation of its basic assumptions. This theory shares with Stochastic Electrodynamics the core assumption that quantization comes about from the permanent interaction between matter and the vacuum radiation field, but it departs from it when it comes to considering the effect that this interaction has on the statistical properties of the nearby field. In the transition to the quantum regime, correlations between field modes of well-defined characteristic frequencies arise, (...)
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  7.  48
    Stochastic theory for classical and quantum mechanical systems.L. de la Peña & A. M. Cetto - 1975 - Foundations of Physics 5 (2):355-370.
    We formulate from first principles a theory of stochastic processes in configuration space. The fundamental equations of the theory are an equation of motion which generalizes Newton's second law and an equation which expresses the condition of conservation of matter. Two types of stochastic motion are possible, both described by the same general equations, but leading in one case to classical Brownian motion behavior and in the other to quantum mechanical behavior. The Schrödinger equation, which is derived here with no (...)
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  8.  74
    The wave properties of matter and the zeropoint radiation field.L. de la Peña & A. M. Cetto - 1994 - Foundations of Physics 24 (5):753-781.
    The origin of the wave properties of matter is discussed from the point of view of stochastic electrodynamics. A nonrelativistic model of a charged particle with an effective structure embedded in the random zeropoint radiation field reveals that the field induces a high-frequency vibration on the particle; internal consistency of the theory fixes the frequency of this jittering at mc2/ħ. The particle is therefore assumed to interact intensely with stationary zeropoint waves of this frequency as seen from its proper frame (...)
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  9. De la combustion de la matière dans l'action musculaire: Dossier Helmholtz.Hermann V. Helmholtz - 2003 - Philosophia Scientiae 7 (1):13-21.
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  10. De l'application de la loi de la conservation de la force à la nature organique: Dossier Helmholtz.Hermann V. Helmholtz - 2003 - Philosophia Scientiae 7 (1):29-41.
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  11.  35
    Quantum mechanics derived from stochastic electrodynamics.L. de la Peña-Auerbach & A. M. Cetto - 1978 - Foundations of Physics 8 (3-4):191-210.
    The connection between stochastic electrodynamics (SED) and the quantum theory of matter is further explored. The main result is that the Fokker-Planck-like equation of SED can be recast into the form of a Schrödinger equation with radiative corrections, when the system is close to a state of equilibrium. The phase-space distribution can be written as Wigner's pseudo-distribution plus corrections due to the nonlinearity of the external force and to radiative effects. The radiative corrections predicted by the theory, namely the Lamb (...)
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  12.  22
    Coexistence of multiple periodic and chaotic regimes in biochemical oscillations with phase shifts.I. M. de la Fuente, L. Martinez, J. M. Aguirregabiria & J. Veguillas - 1998 - Acta Biotheoretica 46 (1):37-51.
    The numerical study of a glycolytic model formed by a system of three delay differential equations reveals a multiplicity of stable coexisting states: birhythmicity, trirhythmicity, hard excitation and quasiperiodic with chaotic regimes. For different initial functions in the phase space one may observe the coexistence of two different quasiperiodic motions, the existence of a stable steady state with a stable torus, and the existence of a strange attractor with different stable regimes (chaos with torus, chaos with bursting motion, and chaos (...)
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  13.  15
    De l’origine et de la signification des axiomes géométriques.Hermann von Helmholtz & Jean-Baptiste Fournier - 2017 - Philosophie 134 (3):15.
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  14.  12
    De l’origine et de la signification des axiomes géométriques.Hermann von Helmholtz & Jean-Baptiste Fournier - 2017 - Philosophie 134 (3):3.
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  15.  17
    Sur l’ambition de vulgariser la science (1874).Hermann von Helmholtz - 2005 - Philosophia Scientiae 9 (1):59-71.
    We propose a French translation of the preface written by H. nov Helmholtz to the German translation of Fragments of Science by Tyndall. The German translation was by Anna von Helmholtz and Du-Bois Reymond and reviewed by H. von Helmholtz. The numbers in square brackets refer to the page numbers of the original text.RésuméNous proposons une traduction française de la préface de H. von Helmholtz à la traduction allemande des Fragments of Science de Tyndall, traduction allemande (...)
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  16.  12
    Sur l’ambition de vulgariser la science (1874).Hermann von Helmholtz - 2005 - Philosophia Scientiae 9:59-71.
    Nous proposons une traduction française de la préface de H. von Helmholtz à la traduction allemande des Fragments of Science de Tyndall, traduction allemande réalisée par Anna von Helmholtz et Du-Bois Reymond et revue par H. von Helmholtz. Les nombres entre crochets rappellent la pagination du texte original.
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  17.  21
    De la combustion de la matière dans l'action musculaire.Hermann V. Helmholtz - 2003 - Philosophia Scientiae 7 (1):13-21.
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  18.  20
    De l'application de la loi de la conservation de la force à la nature organique.Hermann V. Helmholtz - 2003 - Philosophia Scientiae 7 (1):29-41.
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  19.  17
    Un rapport inédit sur divers travaux d’Angelo Mosso.Hermann von Helmholtz & Alexandre Métraux - 2013 - Philosophia Scientiae 17 (3):206-207.
    Note du traducteur: La transcription rend fidèlement l’orthographe de l’inédit autographe de Helmholtz, et cela jusqu’à l’oubli du « t » dans le mot « nicht », erreur que l’auteur ne semble pas avoir remarquée ou à laquelle il ne devait pas accorder d’importance, vu qu’il s’agissait, probablement, d’une ébauche très avancée du rapport qui aurait dû, ou pu, être copiée, après correction, pour l’envoi en Italie.Dans la transcription ainsi que dans la traduction, l’espace laissé en blanc d’une...
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  20.  11
    Deux notes sur la vitesse de la propagation de l'agent nerveux dans les nerfs rachidiens.Hermann V. Helmholtz - 2003 - Philosophia Scientiae 7 (1):79-84.
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  21.  14
    Un rapport inédit sur divers travaux d'Angelo Mosso.Hermann von Helmholtz - 2013 - Philosophia Scientiae 17:206-207.
    Note du traducteur: La transcription rend fidèlement l’orthographe de l’inédit autographe de Helmholtz, et cela jusqu’à l’oubli du « t » dans le mot « nicht », erreur que l’auteur ne semble pas avoir remarquée ou à laquelle il ne devait pas accorder d’importance, vu qu’il s’agissait, probablement, d’une ébauche très avancée du rapport qui aurait dû, ou pu, être copiée, après correction, pour l’envoi en Italie.Dans la transcription ainsi que dans la traduction, l’espace laissé en blanc d’une..
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  22.  21
    Un rapport inédit sur divers travaux d’Angelo Mosso.Hermann von Helmholtz - 2013 - Philosophia Scientiae 17:206-207.
    Note du traducteur: La transcription rend fidèlement l’orthographe de l’inédit autographe de Helmholtz, et cela jusqu’à l’oubli du « t » dans le mot « nicht », erreur que l’auteur ne semble pas avoir remarquée ou à laquelle il ne devait pas accorder d’importance, vu qu’il s’agissait, probablement, d’une ébauche très avancée du rapport qui aurait dû, ou pu, être copiée, après correction, pour l’envoi en Italie.Dans la transcription ainsi que dans la traduction, l’espace laissé en blanc d’une...
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  23.  21
    Sur le voir humain (1855).Hermann von Helmholtz - 2010 - Philosophia Scientiae 14 (1):13-35.
    Assemblée très honorée, Ce qui nous réunit ce jour, c'est la mémoire d'un homme qui plus qu'aucun autre a contribué à lier indissolublement le nom de notre ville à l'histoire culturelle de l'humanité, je veux parler de Kant, le Philosophe. Nous souhaitons ériger un monument à sa mémoire, pour montrer que notre époque et notre ville nourrissent un souvenir reconnaissant et respectueux envers les hommes qui leur apportent progrès scientifique et instruction. Par la présente conférence, je souha...
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  24.  13
    Sur le voir humain (1855).Hermann von Helmholtz - 2010 - Philosophia Scientiae 14:13-35.
    Assemblée très honorée, Ce qui nous réunit ce jour, c'est la mémoire d'un homme qui plus qu'aucun autre a contribué à lier indissolublement le nom de notre ville à l'histoire culturelle de l'humanité, je veux parler de Kant, le Philosophe. Nous souhaitons ériger un monument à sa mémoire, pour montrer que notre époque et notre ville nourrissent un souvenir reconnaissant et respectueux envers les hommes qui leur apportent progrès scientifique et instruction. Par la présente conférence, je souha...
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  25.  55
    The Impact of the Parental Support on Risk Factors in the Process of Gender Affirmation of Transgender and Gender Diverse People.Bruna L. Seibel, Bruno de Brito Silva, Anna M. V. Fontanari, Ramiro F. Catelan, Ana M. Bercht, Juliana L. Stucky, Diogo A. DeSousa, Elder Cerqueira-Santos, Henrique C. Nardi, Silvia H. Koller & Angelo B. Costa - 2018 - Frontiers in Psychology 9.
    Research involving transgender and gender diverse people (TGD) increased in the last years, mostly concerning healthcare associated to this population. Few studies dedicated their analysis to the impact of parental support on transgender people, even though this is an important aspect in creating a safe environment on which these individuals can build their identity. In addition, the link between family support, TGD identity and homelessness is not completely established. Thus, due to the specificities of the family context of TGD individuals, (...)
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  26.  17
    Dual Relativistic Quantum Mechanics I.Tepper L. Gill, Gonzalo Ares de Parga, Trey Morris & Mamadou Wade - 2022 - Foundations of Physics 52 (4):1-21.
    It was shown in Dirac A117, 610; A118, 351, 1928) that the ultra-violet divergence in quantum electrodynamics is caused by a violation of the time-energy uncertainly relationship, due to the implicit assumption of infinitesimal time information. In Wheeler et al. it was shown that Einstein’s special theory of relativity and Maxwell’s field theory have mathematically equivalent dual versions. The dual versions arise from an identity relating observer time to proper time as a contact transformation on configuration space, which leaves phase (...)
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  27.  54
    Proceedings of the 4th World Conference on Research Integrity: Brazil, Rio de Janeiro. 31 May - 3 June 2015.Lex Bouter, Melissa S. Anderson, Ana Marusic, Sabine Kleinert, Susan Zimmerman, Paulo S. L. Beirão, Laura Beranzoli, Giuseppe Di Capua, Silvia Peppoloni, Maria Betânia de Freitas Marques, Adriana Sousa, Claudia Rech, Torunn Ellefsen, Adele Flakke Johannessen, Jacob Holen, Raymond Tait, Jillon Van der Wall, John Chibnall, James M. DuBois, Farida Lada, Jigisha Patel, Stephanie Harriman, Leila Posenato Garcia, Adriana Nascimento Sousa, Cláudia Maria Correia Borges Rech, Oliveira Patrocínio, Raphaela Dias Fernandes, Laressa Lima Amâncio, Anja Gillis, David Gallacher, David Malwitz, Tom Lavrijssen, Mariusz Lubomirski, Malini Dasgupta, Katie Speanburg, Elizabeth C. Moylan, Maria K. Kowalczuk, Nikolas Offenhauser, Markus Feufel, Niklas Keller, Volker Bähr, Diego Oliveira Guedes, Douglas Leonardo Gomes Filho, Vincent Larivière, Rodrigo Costas, Daniele Fanelli, Mark William Neff, Aline Carolina de Oliveira Machado Prata, Limbanazo Matandika, Sonia Maria Ramos de Vasconcelos & Karina de A. Rocha - 2016 - Research Integrity and Peer Review 1 (Suppl 1).
    Table of contentsI1 Proceedings of the 4th World Conference on Research IntegrityConcurrent Sessions:1. Countries' systems and policies to foster research integrityCS01.1 Second time around: Implementing and embedding a review of responsible conduct of research policy and practice in an Australian research-intensive universitySusan Patricia O'BrienCS01.2 Measures to promote research integrity in a university: the case of an Asian universityDanny Chan, Frederick Leung2. Examples of research integrity education programmes in different countriesCS02.1 Development of a state-run “cyber education program of research ethics” in (...)
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  28. Understanding the Contribution of HRM Bundles for Employee Outcomes Across the Life-Span.Klaske N. Veth, Hubert P. L. M. Korzilius, Beatrice I. J. M. Van der Heijden, Ben J. M. Emans & Annet H. De Lange - 2019 - Frontiers in Psychology 10:475130.
    Using the Job Demands-Resources model literature and the life-span theory as scholarly frameworks, we examined the effects of job demands and job resources as mediators in the relationship between bundles of used HRM practices and employee outcomes. In addition, we tested for age differences in our research model. Findings confirmed the hypothesized original 2-factor structure representing maintenance and development HRM practices. Structural Equation Modeling analyses showed that the maintenance HRM bundle related directly and negatively to employee outcomes, without moderating effects (...)
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  29.  36
    On the origin of frequency distributions in biology.L. G. M. Baas Becking & E. F. Drion - 1936 - Acta Biotheoretica 1 (3):133-150.
    Die Frequenzkurven, die die lebendige Substanz charakterisieren, können als eine statische Beschreibung oder als das Ergebnis einer Entwicklung betrachtet werden.Im ersten Falle akzeptiert man ohne weiteres die gegebenen Verteilungen und man versucht, ihnen durch mathematische Gleichungen, die keine unmittelbare Wirklich-keitsbedeutung haben, nahezukommen. Das kausale Denken wird hier ausgeschaltet oder man gibt sich wenigstens mit nur sehr groben Analogien zufrieden.Verschiedene Methoden über die Genese der Frequenzkurven werden besprochen; dabei wird gezeigt, dass die Mehrheit der Fälle auf Hypothesen beruht, die biologisch wenig (...)
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  30.  37
    Traveling-Wave Solutions for Korteweg–de Vries–Burgers Equations through Factorizations.O. Cornejo-Pérez, J. Negro, L. M. Nieto & H. C. Rosu - 2006 - Foundations of Physics 36 (10):1587-1599.
    Traveling-wave solutions of the standard and compound form of Korteweg–de Vries–Burgers equations are found using factorizations of the corresponding reduced ordinary differential equations. The procedure leads to solutions of Bernoulli equations of non-linearity 3/2 and 2 (Riccati), respectively. Introducing the initial conditions through an imaginary phase in the traveling coordinate, we obtain all the solutions previously reported, some of them being corrected here, and showing, at the same time, the presence of interesting details of these solitary waves that have been (...)
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  31.  42
    A mathematical model of the equilibrium distribution of chemical complexes and the biological effects of chemical binding.L. D. Homer - 1967 - Acta Biotheoretica 17 (3):125-138.
    A general equation is derived describing the concentration of all possible complexes of a central molecule with a set of ligands bound to the central molecule. This deduction allows the reaction rate constants for the binding of a given molecule to the central molecule to depend on the species of molecules already bound and the location of the molecules already bound. The model thus allows for structural alteration of the central molecule by binding. Functions describing the concentration dependence of any (...)
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  32.  20
    Individual Particle Localization per Relativistic de Broglie–Bohm.David L. Bartley - 2018 - Foundations of Physics 48 (12):1731-1752.
    The significance of the de Broglie/Bohm hidden-particle position in the relativistic regime is addressed, seeking connection to the single-particle Newton–Wigner position. The effect of non-positive excursions of the ensemble density for extreme cases of positive-energy waves is easily computed using an integral of the equations of motion developed here for free spin-0 particles in 1 + 1 dimensions and is interpreted in terms of virtual-like pair creation and annihilation beneath the Compton wavelength. A Bohm-theoretic description of the acausal explosion of (...)
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  33.  66
    Kinematics of a Spacetime with an Infinite Cosmological Constant.R. Aldrovandi, A. L. Barbosa, M. Calçada & J. G. Pereira - 2003 - Foundations of Physics 33 (4):613-624.
    A solution of the sourceless Einstein's equation with an infinite value for the cosmological constant Λ is discussed by using Inönü–Wigner contractions of the de Sitter groups and spaces. When Λ→∞, spacetime becomes a four-dimensional cone, dual to Minkowski space by a spacetime inversion. This inversion relates the four-cone vertex to the infinity of Minkowski space, and the four-cone infinity to the Minkowski light-cone. The non-relativistic limit c→∞ is further considered, the kinematical group in this case being a modified Galilei (...)
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  34.  27
    Zwischen Wärmestoff und kinetischer Gastheorie—Die Behandlung der Physik der Wärme durch Hermann Helmholtz.Stefan L. Wolff - 1997 - NTM Zeitschrift für Geschichte der Wissenschaften, Technik und Medizin 5 (1):90-103.
    In spite of the fact that Helmholtz made a decisive contribution to the first principle of thermodynamics by his Erhaltung der Kraft of 1847 he did not participate actively in the following debates about the nature of heat. Probably he was cautious in some way as he did not yet belong to the community of university physicists. His research concentrated on physiology at that time. On the other hand he was rather influential by his public speeches and his comprehensive (...)
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  35.  58
    An association account of false belief understanding.L. C. De Bruin & Albert Newen - 2012 - Cognition 123 (2):240-259.
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  36. The developmental paradox of false belief understanding: a dual-system solution.L. C. De Bruin & A. Newen - 2014 - Synthese 191 (3).
    We explore the developmental paradox of false belief understanding. This paradox follows from the claim that young infants already have an understanding of false belief, despite the fact that they consistently fail the elicited-response false belief task. First, we argue that recent proposals to solve this paradox are unsatisfactory because they (i) try to give a full explanation of false belief understanding in terms of a single system, (ii) fail to provide psychological concepts that are sufficiently fine-grained to capture the (...)
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  37.  25
    Alexis Fontaine's integration of ordinary differential equations and the origins of the calculus of several variables.John L. Greenberg - 1982 - Annals of Science 39 (1):1-36.
    Alexis Fontaine des Bertins was the first French mathematician to make use of the calculus of several variables in the integration of ordinary differential equations . In this paper I argue that this usage evolved from Fontaine's ‘fluxio-differential method’ of the early 1730s. In this way I extend the thesis enunciated in an earlier paper in this journal.
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  38. Some thirteenth century tracts on the game of obligation.L. M. De Rijk - 1974 - Vivarium 12 (2):94-123.
  39.  83
    Brain death, states of impaired consciousness, and physician-assisted death for end-of-life organ donation and transplantation.Joseph L. Verheijde, Mohamed Y. Rady & Joan L. McGregor - 2009 - Medicine, Health Care and Philosophy 12 (4):409-421.
    In 1968, the Harvard criteria equated irreversible coma and apnea with human death and later, the Uniform Determination of Death Act was enacted permitting organ procurement from heart-beating donors. Since then, clinical studies have defined a spectrum of states of impaired consciousness in human beings: coma, akinetic mutism, minimally conscious state, vegetative state and brain death. In this article, we argue against the validity of the Harvard criteria for equating brain death with human death. Brain death does not disrupt somatic (...)
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  40.  9
    L'Eucharistie chez Ignace d'Antioche et Polycarpe de Smyrne.L. de Bellescize - 2010 - Nouvelle Revue Théologique 132 (2):197-216.
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  41.  86
    Some notes on the mediaeval tract de insolubilibus, with the edition of a tract dating from the end of the twelfth century.L. M. De Rijk - 1966 - Vivarium 4 (1):83-115.
  42.  32
    Some Thirteenth Century Tracts on the Game of Obligation.L. M. De Rijk - 1975 - Vivarium 13 (1):22-54.
  43.  65
    On the chronology of Boethius' works on logic I.L. M. De Rijk - 1964 - Vivarium 2 (1):1-49.
  44.  13
    De indeling der middeleeuwse wijsbegeerte.L. M. de Rijk - 1966 - Bijdragen 27 (2):229-236.
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  45. On The Genuine Text of Peter of Spain's Summule logicales.L. M. De Rijk - 1969 - Vivarium 7 (1):120-162.
  46.  57
    'Enkylios paideia'. A Study of Its Original Meaning.L. M. De Rijk - 1965 - Vivarium 3 (1):24-93.
  47.  53
    Préface à la traduction de Helmholtz : « Du rapport des sciences de la nature à l’ensemble de la science ».Alexandre Willmann Métraux - 2024 - Philosophia Scientiae 28:9-18.
    Cette préface présente le contexte politique et culturel du fameux discours de Helmholtz prononcé à Heidelberg le 22 novembre 1862, où il défend une certaine idée de l’université et des relations entre les différentes disciplines qu’elle enseigne. L’idée de pluridisciplinarité, tant invoquée aujourd’hui, est au cœur de son propos, ainsi que celle d’une conciliation possible entre philosophie et sciences de la nature, mais en partant du point de vue de ces dernières.
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  48.  89
    The Development of Suppositio naturalis in Mediaeval Logic.L. M. De Rijk - 1973 - Vivarium 11 (1):43-78.
  49. Some notes on the twelfth century topic of the three (four) human evils and of science, virtue, and techniques as their remedies.L. M. De Rijk - 1967 - Vivarium 5 (1):8-15.
  50.  18
    The structure of singularities in space-times with torsion.L. C. Garcia de Andrade - 1990 - Foundations of Physics 20 (4):403-416.
    An analysis of the extension of the Hawking-Penrose singularity theorem to Riemann-Cartan U4 space-times with torsion and spin density is undertaken. The minimal coupling principle in U4 is used to formulate a new expression for the convergence condition autoparallels in Einstein-Cartan theory. The Gödel model with torsion is given as an example.
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