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Spectral evolution in an insulator exhibiting linear specific heat  [PDF]
R. Bindu,Ganesh Adhikary,Sudhir K. Pandey,Kalobaran Maiti
Physics , 2009, DOI: 10.1088/1367-2630/12/3/033003
Abstract: We investigate the spectral evolution of an antiferromagnetic insulator, La$_{0.2}$Sr$_{0.8}$MnO$_3$ exhibiting linear specific heat using state-of-the-art high resolution photoemission spectroscopy. Experimental spectral functions exhibit Fermi liquid like energy dependence at all the temperatures studied. Room temperature spectrum possess finite density of states at the Fermi level that vanishes generating a soft gap at about 260 K (the magnetic transition temperature). High resolution spectra reveal a hard gap in the magnetically ordered phase (C-type antiferromagnet). These results indicate signature of an amorphous phase coexisting with the long range ordered phase in these materials.
Review Essay: Wissen, Subjekt und Politik Review Essay: Knowledge, Subjectivity and Politics Ensayo: Conocimiento, subjetividad y política
Thomas Pfister
Forum : Qualitative Social Research , 2010,
Abstract: Die besprochene Monografie interessiert sich besonders für Manifestationen von Subjektivit t in der Wissensgesellschaft. In einem ersten Teil verfolgt die Studie, wie die diskursive Ordnung der Wissensgesellschaft auch auf der dominanten Konzeption eines unabh ngigen, eigenverantwortlichen und wissensf higen Subjekts beruht. Der zweite Teil untersucht daraufhin am Beispiel von Bürgerkonferenzen zu Themen der Biomedizin, wie sich einzelne Subjekte im Verh ltnis zu dieser diskursiv vorgegebenen Subjektivit tsvorstellung verhalten und selbst als Subjekte konstituieren. Dabei kommt vor allem diese zweite Teilstudie zu wirklich neuen und überraschenden Einsichten. Allerdings wird ihr im Vergleich zum ersten Teil zu wenig Raum gew hrt, um ihr volles Potenzial zu entfalten. Angeregt durch die Diskussion von JUNGEs Buch werden zwei weitere Punkte diskutiert. In einem ersten Schritt muss die Wissenschaft an sich noch etwas genauer betrachtet werden, da diese eine entscheidende Rolle in denjenigen Aushandlungsprozessen spielt, in deren Rahmen die Wissensgesellschaft geschaffen und ausgestaltet wird. Daraufhin wird ein Politikbegriff n her bestimmt, der zwar umfassend, zugleich aber nicht zu allgemein sein soll. Daher wird vorgeschlagen, Politik als graduelles Ph nomen zu verstehen, das zwar allgegenw rtig sein mag, in bestimmten Situationen aber besonders deutlich zutage tritt. Um Politik im Kontext einer Pluralisierung des Wissens zu analysieren wird empfohlen, sich auf Situationen zu konzentrieren, in denen Agency und agonistischer Widerstreit sichtbar werden. URN: urn:nbn:de:0114-fqs1003207 The main interest of the study reviewed in this essay is in manifestations of subjectivity in the knowledge society. The first part demonstrates how the discourse on a knowledge society also constructs the dominant notion of an autonomous, self-reliant and intellectually capable subject. Then, the book traces how individuals act and constitute themselves in response to the discursive call for specific forms of subjectivity, focusing on a set of citizen conferences on biomedical issues. It thus, especially in its latter part, provides original and surprising insights, but this part is given too little space compared to the first part, leaving the reader wanting more. The essay then engages in a broader debate, discussing two further points in addition to the insights of the review. First, it scrutinises the function of science, which plays a key role in those negotiations where the knowledge society is constituted and shaped. Secondly, it seeks to refine the notion of politic
Man should not let death attain the dominion of his thoughts: An Essay on Subjectivity, Self-Preservation and Immortality  [PDF]
Kasper Lysemose
Meta : Research in Hermeneutics, Phenomenology and Practical Philosophy , 2010,
Abstract: Mortality seems to have no place in the theories on subjectivity in Kant and Husserl. It is suggested that this entente cordiale is an expression of the shared principle at the heart of their philosophy, i.e. the principle of selfpreservation. Self-preservation is a principle that in a certain sense excludes mortality. It is argued that the primary sense of this exclusion is not theoretical but practical. Kant and Husserl are both endorsing the imperative that man should not let death attain the dominion of his thoughts (cf. Mann 1976, 600). The positive correlate to this is to be found in the demand that man should think of himself as if he was immortal. With special regard to Husserl the predicament that accompanies his relentless attempt to fulfill this demand is described as a sluice through which anthropology threatens to flow into the phenomenological enterprise.
Asymmetric subjectivity
Prole Dragan
Theoria, Beograd , 2008, DOI: 10.2298/theo0804027p
Abstract: The author inspects the reasons because of which of the Levinas' thematic of being becomes completely irrelevant as a fundamental ontology and phenomenology of constitution. Levinas will legitimize his opinion as phenomenological while trying to affirm the basic phenomenological position that the origin of our cognitions is always based upon the mutual world. The concept of asymmetric subjectivity is the only possibility for answering the philosophical demand that the others do not appear to me via a prearranged coordinate system of selfness. After confronting the Lipps' Theory of 'Verdoppelung' and the Husserl's transcendental ego, the second part explores the difficulties which Levinas' imperative of absolute otherness is faced with. By all means, he preserves the asymmetric structure of subjectivity, but he also faces it with the difficulties of self-induct as subjectivity.
Subjectivity and Meaning
Jens Brockmeier
Journal für Psychologie , 2008,
Abstract: In 1983 – 25 years ago – Klaus Holzkamp’s main work Grundlegung der Psychologie [Foundations of Psychology] was published. On this occasion, this essay reviews the historical and cultural situation in which the book appeared and the role of Holzkamp as activist of the 1968 movement in Berlin and within German psychology as well as leading theoretician of German Critical Psychology. The book is situated against the backdrop of recent theoretical developments in the field of alternative Psychology and the Social Sciences, as well as in respect to historically simultaneous and earlier ideas in psychology and philosophy which have received only little attention, especially in the discussion of the Grundlegung’s central themes subjectivity and meaning.
Protein Secretion Systems in Pseudomonas aeruginosa: An Essay on Diversity, Evolution, and Function  [PDF]
Alain Filloux
Frontiers in Microbiology , 2011, DOI: 10.3389/fmicb.2011.00155
Abstract: Protein secretion systems are molecular nanomachines used by Gram-negative bacteria to thrive within their environment. They are used to release enzymes that hydrolyze complex carbon sources into usable compounds, or to release proteins that capture essential ions such as iron. They are also used to colonize and survive within eukaryotic hosts, causing acute or chronic infections, subverting the host cell response and escaping the immune system. In this article, the opportunistic human pathogen Pseudomonas aeruginosa is used as a model to review the diversity of secretion systems that bacteria have evolved to achieve these goals. This diversity may result from a progressive transformation of cell envelope complexes that initially may not have been dedicated to secretion. The striking similarities between secretion systems and type IV pili, flagella, bacteriophage tail, or efflux pumps is a nice illustration of this evolution. Differences are also needed since various secretion configurations call for diversity. For example, some proteins are released in the extracellular medium while others are directly injected into the cytosol of eukaryotic cells. Some proteins are folded before being released and transit into the periplasm. Other proteins cross the whole cell envelope at once in an unfolded state. However, the secretion system requires conserved basic elements or features. For example, there is a need for an energy source or for an outer membrane channel. The structure of this review is thus quite unconventional. Instead of listing secretion types one after each other, it presents a melting pot of concepts indicating that secretion types are in constant evolution and use basic principles. In other words, emergence of new secretion systems could be predicted the way Mendele?ev had anticipated characteristics of yet unknown elements.
Evolution of the Spin Gap Upon Doping a 2-Leg Ladder  [PDF]
D. Poilblanc,O. Chiappa,J. Riera,S. R. White,D. J. Scalapino
Physics , 2000, DOI: 10.1103/PhysRevB.62.R14633
Abstract: The evolution of the spin gap of a 2-leg ladder upon doping depends upon the nature of the lowest triplet excitations in a ladder with two holes. Here we study this evolution using various numerical techniques for a t-t'-J ladder as the next-near-neighbor hopping t' is varied. We find that depending on the value of t', the spin gap can evolve continuously or discontinuously and the lowest triplet state can correspond to a magnon, a bound magnon-hole-pair, or two separate quasi-particles. Previous experimental results on the superconducting two-leg ladder Sr12Ca2Cu24O41 are discussed.
Evolution of structure of SiO2 nanoparticles upon cooling from the melt
Xuan Huynh Nguyen,Van Hoang Vo,Zung Hoang
PMC Physics B , 2008, DOI: 10.1186/1754-0429-1-16
Abstract: Evolution of structure of spherical SiO2 nanoparticles upon cooling from the melt has been investigated via molecular-dynamics (MD) simulations under non-periodic boundary conditions (NPBC). We use the pair interatomic potentials which have weak Coulomb interaction and Morse type short-range interaction. The change in structure of SiO2 nanoparticles upon cooling process has been studied through the partial radial distribution functions (PRDFs), coordination number and bond-angle distributions at different temperatures. The core and surface structures of nanoparticles have been studied in details. Our results show significant temperature dependence of structure of nanoparticles. Moreover, temperature dependence of concentration of structural defects in nanoparticles upon cooling from the melt toward glassy state has been found and discussed. PACS Codes: 61.43.Bn; 78.55.Qr; 78.67.Bf
Evolution of the electronic band structure of twisted bilayer graphene upon doping  [PDF]
Shengqiang Huang,Matthew Yankowitz,Kanokporn Chattrakun,Arvinder Sandhu,Brian J. LeRoy
Physics , 2015,
Abstract: The electronic band structure of twisted bilayer graphene depends on the twist angle between the two layers. In particular, van Hove singularities occur in the density of states when the two sets of monolayer bands cross. An enhanced Raman G peak is observed when the excitation laser is resonant with the energy separation of these singularities. Using Raman spectroscopy, we monitor the evolution of the electronic band structure for various twist angles upon charge doping. The variation of the Raman G peak area with charge density reveals changes in the electronic band structure, and a decrease in the energy of the resonant scattering pathway is inferred from the twist angle dependence. This decrease is due to a charge density asymmetry between the two layers. Our results demonstrate that the electronic and optical properties of twisted bilayer graphene can be controlled by doping.
Subjectivity, Bayesianism, and Causality  [PDF]
Pedro A. Ortega
Computer Science , 2014,
Abstract: Bayesian probability theory is one of the most successful frameworks to model reasoning under uncertainty. Its defining property is the interpretation of probabilities as degrees of belief in propositions about the state of the world relative to an inquiring subject. This essay examines the notion of subjectivity by drawing parallels between Lacanian theory and Bayesian probability theory, and concludes that the latter must be enriched with causal interventions to model agency. The central contribution of this work is an abstract model of the subject that accommodates causal interventions in a measure-theoretic formalisation. This formalisation is obtained through a game-theoretic Ansatz based on modelling the inside and outside of the subject as an extensive-form game with imperfect information between two players. Finally, I illustrate the expressiveness of this model with an example of causal induction.
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