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Search Results: 1 - 10 of 16020 matches for " Christian Fuchs "
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The Role of the Individual in the Social Information Process
Christian Fuchs
Entropy , 2003, DOI: 10.3390/e5010034
Abstract: The aim of this paper is to point out which role the individual plays in the generation of information in social systems. First, it is argued that the individual is a social, self-conscious, creative, reflective, cultural, symbol- and language-using, active natural, producing, labouring, objective, corporeal, living, real, sensuous, visionary, imaginative, designing, co-operative being that makes its own history and can strive towards freedom and autonomy. Based on these assumptions the re-creation/self-organisation of social systems is described as a dialectic of actions and social structures and as a dialectic of individual information and social information. The individual enters economic, political and cultural relationships that result in the emergence and differentiation of social (i.e. economic, political and cultural) information which enables and constrains individual actions and thinking. Individuals as actors in social systems are indispensable for social self-organisation.
An Alternative View of Privacy on Facebook
Christian Fuchs
Information , 2011, DOI: 10.3390/info2010140
Abstract: The predominant analysis of privacy on Facebook focuses on personal information revelation. This paper is critical of this kind of research and introduces an alternative analytical framework for studying privacy on Facebook, social networking sites and web 2.0. This framework is connecting the phenomenon of online privacy to the political economy of capitalism—a focus that has thus far been rather neglected in research literature about Internet and web 2.0 privacy. Liberal privacy philosophy tends to ignore the political economy of privacy in capitalism that can mask socio-economic inequality and protect capital and the rich from public accountability. Facebook is in this paper analyzed with the help of an approach, in which privacy for dominant groups, in regard to the ability of keeping wealth and power secret from the public, is seen as problematic, whereas privacy at the bottom of the power pyramid for consumers and normal citizens is seen as a protection from dominant interests. Facebook’s privacy concept is based on an understanding that stresses self-regulation and on an individualistic understanding of privacy. The theoretical analysis of the political economy of privacy on Facebook in this paper is based on the political theories of Karl Marx, Hannah Arendt and Jürgen Habermas. Based on the political economist Dallas Smythe’s concept of audience commodification, the process of prosumer commodification on Facebook is analyzed. The political economy of privacy on Facebook is analyzed with the help of a theory of drives that is grounded in Herbert Marcuse’s interpretation of Sigmund Freud, which allows to analyze Facebook based on the concept of play labor (= the convergence of play and labor).
Kaon production in heavy ion reactions at intermediate energies
Christian Fuchs
Physics , 2005, DOI: 10.1016/j.ppnp.2005.07.004
Abstract: The article reviews the physics related to kaon and antikaon production in heavy ion reactions at intermediate energies. Chiral dynamics predicts substantial modifications of the kaon properties in a dense nuclear environment. The status of the theoretical predictions as well as experimental evidences for medium effects such as repulsive/attractive mass shifts for $K^+/K^-$ are reviewed. In the vicinity of the thresholds, and even more pronounced below threshold, the production of strangeness is a highly collective process. Starting from elementary reaction channels the phenomenology of $K^+$ and $K^-$ production, i.e. freeze-out densities, time scales etc. as derived from experiment and theoretical transport calculations is presented. Below threshold kaon production shows a high sensitivity on the nuclear compression reached in heavy ion reactions. This allows to put constraints on the nuclear equation-of-state which are finally discussed.
The high density equation of state: constraints from accelerators and astrophysics
Christian Fuchs
Physics , 2007,
Abstract: The nuclear equation of state (EoS) at high densities and/or extreme isospin is one of the longstanding problems of nuclear physics. In the last years substantial progress has been made to constrain the EoS both, from the astrophysical side and from accelerator based experiments. Heavy ion experiments support a soft EoS at moderate densities while the possible existence of high mass neutron star observations favors a stiff EoS. Ab initio calculations for the nuclear many-body problem make predictions for the density and isospin dependence of the EoS far away from the saturation point. Both, the constraints from astrophysics and accelerator based experiments are shown to be in agreement with the predictions from many-body theory.
Strangeness production in heavy ion reactions at intermediate energies
Christian Fuchs
Physics , 2003, DOI: 10.1016/j.ppnp.2004.02.023
Abstract: Kaon production, in particular $K^+$ production in heavy ion collisions at intermediate energies is discussed. Main emphasis is put on the question if subthreshold $K^+$ production can serve as a suitable tool to test the high density phase of such reactions and to deliver information on the high density behavior of the nuclear equation of state. It is shown that the $K^+$ excitation function in heavy ($Au+Au$) over light ($C+C$) systems provides a robust observable which, by comparison to data, strongly favors a soft equation of state. A second question of interest is the existence of an in-medium kaon potential as predicted by effective chiral Lagrangiens. Here it is argued that transport calculations support this scenario with, in the meantime, a significant level of consistency.
The Nuclear Equation of State at high densities
Christian Fuchs
Physics , 2006,
Abstract: Ab inito calculations for the nuclear many-body problem make predictions for the density and isospin dependence of the nuclear equation-of-state (EOS) far away from the saturation point of nuclear matter. I compare predictions from microscopic and phenomenological approaches. Constraints on the EOS derived from heavy ion reactions, in particular from subthreshold kaon production, as well as constraints from neutron stars are discussed.
Recent progress constraining the nuclear equation of state from astrophysics and heavy ion reactions
Christian Fuchs
Physics , 2007, DOI: 10.1088/0954-3899/35/1/014049
Abstract: The quest for the nuclear equation of state (EoS) at high densities and/or extreme isospin is one of the longstanding problems of nuclear physics. Ab initio calculations for the nuclear many-body problem make predictions for the density and isospin dependence of the EoS far away from the saturation point of nuclear matter. On the other hand, in recent years substantial progress has been mode to constrain the EoS both, from the astrophysical side and from accelerator based experiments. Heavy ion experiments support a soft EoS at moderate densities while recent neutron star observations require a ``stiff'' high density behavior. Both constraints are discussed and shown to be in agreement with the predictions from many-body theory.
Una contribución a la crítica de la economía política del capitalismo informacional transnacional
Fuchs,Christian; Restrepo,Santiago;
Nómadas , 2012,
Abstract: the purpose of this article is to discuss the micro and macro economical changes related to the information and communication technologies (tic). there are discussed key concepts to understand contemporary society, introducing the notion of informational / web transnational capitalism. subsequently, the causes of contemporary social changes are outlined, as well as a discussion on some important aspects of capital accumulation done through products and tic. we conclude with the concepts that describe the new relationship between capitalism and tic.
Dilepton production in elementary and in heavy ion reactions
Christian Fuchs,Amand Faessler
Physics , 2004, DOI: 10.1016/j.ppnp.2004.02.011
Abstract: We present a unified description of the vector meson and dilepton production in elementary and in heavy ion reactions. The production of vector mesons ($\rho,\omega,\phi$) is described via the excitation of nucleon resonances ($R$). The theoretical framework is an extended vector meson dominance model (eVMD) for resonance decays $R\longmapsto NV$ with arbitrary spin which is covariant and kinematically complete. The eVMD includes thereby excited vector meson states in the transition form factors. The model has successfully been applied to $\omega$ and $\phi$ production in $p+p$ reactions. The same model is used to describe the dilepton production in elementary reactions where corresponding data are well reproduced. However, when the model is applied to heavy ion reactions in the BEVALAC/SIS energy range the experimental dilepton spectra measured by the DLS Collaboration are significantly underestimated at small invariant masses. In view of this fact we discuss further medium effects: One is a substantial collisional broadening of the $\rho$ and in particular of the $\omega$ meson in the vicinity of the $\rho/\omega$-peak. The second medium effect is the destruction of quantum interference in a dense medium. A decoherent dilepton emission through vector mesons decays enhances the corresponding low mass dilepton yield in heavy ion reactions and improves the agreement with existing data.
Optical properties of quantum wires: Disorder-scattering in the Lloyd-model
Christian Fuchs,Ralph v. Baltz
Physics , 2000, DOI: 10.1103/PhysRevB.63.085318
Abstract: The Lloyd model is extended to the exciton problem in quasi one-dimensional structures to study the interplay between the Coulomb attraction and disorder scattering. Within this model the averaging and resummation of the locator series can be performed analytically. As an application, the optical absorption in quantum box wires is investigated. Without electron-hole interaction, fluctuations in the well-width lead to an asymmetric broadening of the minibands with respect to the lower and upper band-edges.
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