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Search Results: 1 - 10 of 2204 matches for " Jana Speth "
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“Into the dwelling of the hermit”: Imaginative Space in E.A. Poe’s The Fall of the House of Usher
Jana Speth
Trans : Revue de Littérature Générale et Comparée , 2011,
Abstract: L’article analyse, à l’aide de notions tirées de la psychologie cognitive, tels que les “scripts”, les “concepts” et la “transformation mentale”, la tendance naturelle du lecteur à la construction de sens, c’est-à-dire son aptitude à inférer par l’imagination les informations manquantes d’une architecture imaginaire lacunaire donnée. La narration La chute de la maison d’Usher de E.A. Poe, grace à une mise en abyme, évoque deux réalités imaginaires différentes qui finalement chutent pour faire place à un seul espace focalisé. Les méthodes de Poe qui stimulent la construction des espaces imaginaires aussi bien que leur déconstruction seront analysées avec les outils que nous fournit la neuropsychologie. A hermit lives in complete seclusion from the outer world, and the fictional hermit in E.A. Poe’s narrative enjoys the twofold seclusion of a doubly imaginative space constructed by the reader. Only the deconstruction of the mise en abyme, along with its superordinate fictional space – carefully staged by the author and executed by the reader – poses a threat to his existence, and will finally lead to The Fall of the House of Usher. El artículo analiza con ayuda de nociones extraídas de la psicología cognitiva, como los “scripts”, los “conceptos” y la “transformación mental”, la tendencia natural del lector a construir sentido, es decir, su aptitud para inferir mediante la imaginación las informaciones ausentes en una determinada arquitectura imaginaria y de carácter fragmentario. La narración La caída de la casa Usher, gracias a una mise en abyme, evoca dos realidades imaginarias diferentes que finalmente caen para dar lugar a un único espacio focalizado. Los métodos de Poe que estimulan la construcción de espacios imaginarios tanto como su deconstrucción serán analizados con los instrumentos que nos proporciona la neuropsicología.
K nigin Luise von Preu en als Nationalheldin
Speth, Rudolf
Zeitenblicke , 2004,
Abstract: Die nationale Ged chtnispolitik, die nach dem Tod K nigin Luises 1810 in Preu en einsetzte, weist einige Besonderheiten auf. Die tote K nigin wurde nicht mehr in Formen des monarchischen Totenkultes verehrt. Sie wurde zur Heldin in der Erz hlung von der nationalen Befreiung. Die intellektuellen Verfechter des Konzeptes der Volkserhebung sahen im frühen Tod der K nigin ein brauchbares Symbol für die Mobilisierung des Volkes. Der Luisenkult und die Opferrhetorik erreichten aber erst im Kaiserreich ihren H hepunkt. Erst dort wurde der Luisenkult zum festen Bestandteil des kulturellen Ged chtnisses. Luise wurde auch zur weiblichen Ikone der nationalen Bewegung. Die Stiftung des Luisenordens, das Luisenkreuz und die Popularisierung der Luisengeschichte in Volksbüchern trugen dazu bei, die Frauen in die Nation zu inkludieren. Der Luisenkult ist Teil eines politischen Mythos. Politische Mythen sind Narrationen und dienen der Identit tsstiftung und der Mobilisierung des politischen Verbandes. Ihre Wirkung entfalten sie durch Rituale und Reduktion der komplexen Wirklichkeit auf einfache Deutungs- und Handlungsmuster.
Landau Migdal Theory of Interacting Fermi Systems: A Framework for Effective Theories in Nuclear Structure Physics
Frank Gruemmer,Josef Speth
Physics , 2006, DOI: 10.1088/0954-3899/32/7/R01
Abstract: We review Migdal's Theory of Finite Fermi Systems and its application to the structure of nuclei. The theory is an extension of Landau's Theory of Interacting Fermi Systems. In the first part the basic formulas are derived within the many body Green functions approach. The theory is applied to isovector electric giant resonances in medium and heavy mass nuclei. The parameterizations of the enormalized effective ph-interaction and the effective operators are discussed. It is shown that the number of free parameters are restricted due to conservation laws. We also present an extension of Migdal's theory, where the low-lying phonons are considered in a consistent manner. The extended theory is again applied to the same isovector electric giant resonances and to the analysis of $(\alpha,\alpha^\prime)$ reaction data. We point out that the extended theory is the appropriate frame for self consistent nuclear structure calculations starting from effective Lagrangians and Hamiltonians.
Radiation Effect on Natural Convection Near a Vertical Plate Embedded in Porous Medium with Ramped Wall Temperature  [PDF]
S. Das, M. Jana, R. N. Jana
Open Journal of Fluid Dynamics (OJFD) , 2011, DOI: 10.4236/ojfd.2011.11001
Abstract: Radiation effect on the natural convection flow of an optically thin viscous incompressible fluid near a vertical plate with ramped wall temperature in a porous medium has been studied. The exact solution of momentum and energy equations is obtained by the use of Laplace transform technique. The variations in fluid velocity and temperature are shown graphically whereas the numerical values of shear stress and the rate of heat transfer at the wall are presented in tabular form for various values of flow parameters. The results show that the fluid velocity increases with increase in Grashof number, Darcy number and time parameters whereas the fluid velocity decreases with increase in the radiation parameter and Prandtl number for ramped temperature as well as isothermal wall temperature. It is found that an increase in radiation parameter leads to rise the temperature for both ramped wall temperature as well as isothermal wall temperature. Further, it is found that an increase in Prandtl number leads to fall the temperature for both ramped wall temperature as well as isothermal wall temperature. The shear stress at the wall decreases with increases in either Prandtl number or porosity parameter while the result shows reverse in the case of radiation parameter. Finally, the rate of heat transfer is increased with increases in the radiation parameter for both ramped wall temperature as well as isothermal wall temperature.
Unsteady Couette Flow through a Porous Medium in a Rotating System  [PDF]
Maitree Jana, Sanatan Das, Rabindra Nath Jana
Open Journal of Fluid Dynamics (OJFD) , 2012, DOI: 10.4236/ojfd.2012.24016
Abstract: An investigation has been made on an unsteady Couette flow of a viscous incompressible fluid through a porous me- dium in a rotating system. The solution of the governing equations has been obtained by the use of Laplace transform technique. It is found that the primary velocity decreases and the magnitude of the secondary velocity increases with an increase in rotation parameter. The fluid velocity components are decelerated by an increase of Reynolds number. An increase in porosity parameter leads to increase the primary velocity and the magnitude of the secondary velocity. It is also found that the solution for small time converges more rapidly than the general solution. The asymptotic behavior of the solution is analyzed for small as well as large values of rotation parameter and Reynolds number. It is observed that a thin boundary layer is formed near the moving plate of the channel and the thicknesses of the boundary layer increases with an increase in porosity parameter.
Complement Attack against Aspergillus and Corresponding Evasion Mechanisms
Cornelia Speth,Günter Rambach
Interdisciplinary Perspectives on Infectious Diseases , 2012, DOI: 10.1155/2012/463794
Abstract: Invasive aspergillosis shows a high mortality rate particularly in immunocompromised patients. Perpetually increasing numbers of affected patients highlight the importance of a clearer understanding of interactions between innate immunity and fungi. Innate immunity is considered to be the most significant host defence against invasive fungal infections. Complement represents a crucial part of this first line defence and comprises direct effects against invading pathogens as well as bridging functions to other parts of the immune network. However, despite the potency of complement to attack foreign pathogens, the prevalence of invasive fungal infections is increasing. Two possible reasons may explain that phenomenon: First, complement activation might be insufficient for an effective antifungal defence in risk patients (due to, e.g., low complement levels, poor recognition of fungal surface, or missing interplay with other immune elements in immunocompromised patients). On the other hand, fungi may have developed evasion strategies to avoid recognition and/or eradication by complement. In this review, we summarize the most important interactions between Aspergillus and the complement system. We describe the various ways of complement activation by Aspergillus and the antifungal effects of the system, and also show proven and probable mechanisms of Aspergillus for complement evasion. 1. Aspergillus Evokes Invasive Infections in Immunocompromised Individuals Aspergillus species are ascomycetes that are classified in the form subdivision Deuteromycotina, as many of them do not show a sexual reproductive phase [1]. Generally, they are common ubiquitous saprophytes in soil and on dead organic substrates. Being classic opportunistic pathogens, invasive infections by Aspergillus species almost exclusively develop in immunocompromised patients, while localized infections and allergic bronchopulmonary aspergillosis occur in individuals without immunosuppression. Generally, the species Aspergillus fumigatus represents the most common inducer of invasive and allergic manifestations, followed by A. terreus, A. flavus, and A. niger [1, 2]. Invasive aspergillosis (IA) considerably contributes to the morbidity and mortality among immunocompromised individuals, including patients with haematological malignancies, recipients of haematological stem cell and solid organ transplants, AIDS patients, and patients treated with immunosuppressive regimens due to autoimmune diseases [3]. The most important single risk factor is prolonged and profound neutropenia (<500
Exclusive high-$Q^2$ electroproduction: light-cone wave functions and electromagnetic form factors of mesons,
J. Speth,V. R. Zoller
Physics , 1995, DOI: 10.1016/0370-2693(95)00445-Q
Abstract: We apply the light-cone technique to electroproduction reaction $ep\to e\pi^+n$ long considered as a means of measuring the electromagnetic form factor of the pion. We show that the interpretation of the long-standing puzzle of large transverse cross section ($\sigma_T$) in terms of the $\gamma^*\rho\to \pi$ transition on the $\rho$ mesons in the light-cone proton is possible, but requires quite a slow decrease of the $F_{\rho\pi}(\q2)$ form factor. This interpretation can be tested in the related $ep\to e\pi^0p$ reaction. Corrections which are due to the final-state meson-baryon interactions (FSI) are evaluated and are shown to amount to a $25\%$ effect at moderately large $\q2$. Vanishing FSI with increasing $Q^2$ - the color transparency phenomenon - is shown to be very strong.
Capillary instability on a hydrophilic stripe
Raymond L. Speth,Eric Lauga
Physics , 2009, DOI: 10.1088/1367-2630/11/7/075024
Abstract: A recent experiment showed that cylindrical segments of water filling a hydrophilic stripe on an otherwise hydrophobic surface display a capillary instability when their volume is increased beyond the critical volume at which their apparent contact angle on the surface reaches ninety degrees (Gau et al., Science, 283, 1999). Surprisingly, the fluid segments did not break up into droplets -- as would be expected for a classical Rayleigh-Plateau instability -- but instead displayed a long-wavelength instability where all excess fluid gathered in a single bulge along each stripe. We consider here the dynamics of the flow instability associated with this setup. We perform a linear stability analysis of the capillary flow problem in the inviscid limit. We first confirm previous work showing that that all cylindrical segments are linearly unstable if (and only if) their apparent contact angle is larger than ninety degrees. We then demonstrate that the most unstable wavenumber for the surface perturbation decreases to zero as the apparent contact angle of the fluid on the surface approaches ninety degrees, allowing us to re-interpret the creation of bulges in the experiment as a zero-wavenumber capillary instability. A variation of the stability calculation is also considered for the case of a hydrophilic stripe located on a wedge-like geometry.
Nonperturbative effects in the proton sea
W. Sch?fer,J. Speth
Physics , 1999,
Abstract: We revisit the evaluation of the pionic mechanism of the $\bar{u}-\bar{d}$-asymmetry in the proton structure function. Our analysis is based on the unitarity relation between contributions of different mechanisms to the inclusive particle production and the total photoabsorption cross-section (i.e. the proton structure function). We reanalyze the role of isovector reggeons in inclusive production of nucleons and Delta isobars in hadronic reactions. A rather large contribution of reggeon-exchange induced production of Delta isobars is found. This leaves much less room for the pion-exchange induced mechanism of $\Delta$ production and provides a constraint on the $\pi N \Delta$ form factor. The production of leading pions in proton-proton collisions puts additional constraints on the $\pi NN$ vertex form factors. All these constraints are used then to estimate the pion content of the nucleon and allow to calculate parameter-free the x-dependence of $\bar d - \bar u$. We discuss the violation of the Gottfried Sum Rule and $\bar d$-$\bar u$ asymmetry and compare to the one obtained from the E866 experiment at Fermilab.
A Note on Secondary Buyouts-Creating Value or Recycling Capital  [PDF]
iBusiness (IB) , 2009, DOI: 10.4236/ib.2009.12015
Abstract: This paper analyzes whether secondary buyouts of private equity (PE) investors in general create value and therefore are a suitable alternative to exit strategies like trade sales and IPOs. Theoretically, two conflicting approaches might explain the use of secondary buyouts as an exit channel of private equity investors: the capital recycling effects and different potential sources of value creation. We present empirical tests of these approaches. The profitability of secondary buyouts is assessed by a comparison of exit multiples realized with secondary buyouts and trade sales. The results are not unequivocal, but overall we interpret our findings in a way that awards secondary buyouts a profitability that is not significantly different from trade sales. Therefore, we argue that secondary buyouts have the potential for adding value that arise from different sources like the reduction of agency costs or the functions of the financial investor. Secondary buyouts should thus not be seen as a second best alternative for recycling the PE investors’ capital in situations where alternative—and supposedly more attractive—exit channels are unavailable.
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