1,074 research outputs found

    The shrinking instability of toroidal liquid droplets in the Stokes flow regime

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    We analyze the stability and dynamics of toroidal liquid droplets. In addition to the Rayleigh instabilities akin to those of a cylindrical droplet there is a shrinking instability that is unique to the topology of the torus and dominates in the limit that the aspect ratio is near one (fat tori). We first find an analytic expression for the pressure distribution inside the droplet. We then determine the velocity field in the bulk fluid, in the Stokes flow regime, by solving the biharmonic equation for the stream function. The flow pattern in the external fluid is analyzed qualitatively by exploiting symmetries. This elucidates the detailed nature of the shrinking mode and the swelling of the cross-section following from incompressibility. Finally the shrinking rate of fat toroidal droplets is derived by energy conservation.Comment: 6 pages, 7 figure

    Chaos and Energy Redistribution the Nonlinear Interaction of Two Spatio-Temporal Wave Triplets

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    In this paper we examine the spatio-temporal dynamics of two nonlinearly coupled wave triplets sharing two common modes. Our basic findings are the following. When spatial dependence is absent, the homogeneous manifold so obtained can be chaotic or regular. If chaotic, it drives energy diffusion from long to small wavelengths as soon as inhomogeneous perturbations are added to the system. If regular, one may yet have two distinct cases: (i) energy diffusion is again present if the inhomogeneous modes are linearly unstable and triplets are effectively coupled; (ii) energy diffusion is absent if the inhomogeneous modes are linearly stable or the triplets are uncoupled.Comment: 21 pages, 5 figures, accepted for publication in Physica D (1997

    Fractal entropy of a chain of nonlinear oscillators

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    We study the time evolution of a chain of nonlinear oscillators. We focus on the fractal features of the spectral entropy and analyze its characteristic intermediate timescales as a function of the nonlinear coupling. A Brownian motion is recognized, with an analytic power-law dependence of its diffusion coefficient on the coupling.Comment: 6 pages, 3 figures, revised version to appear in Phys. Rev.

    Mechanismus der enzymatischen Freisetzung von Acetaldehyd aus “aktivem Acetaldehyd” (α-hydroxyaethyl-2-thiaminpyrophosphat)

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    1. 1.Die Freisetzung von Acetaldehyd aus “Aktivem Acetaldehyd” mit gereinigter Apopyruvatdecarboxylase aus Bierhefe wird durch. Thiaminpyrophosphat gehemmt. Diese Konkurrenzhemmung erklärt (zumindest teilweise) die langsame Freisetzung von Acetaldehyd beim enzymatischen Umsatz von Präparaten, die viel Thiamin-pyrophosphat enthalten. 2. 2. Die Freisetzung von Acetaldehyd aus “Aktivem Acetaldehyd” mit Apo-carboxylase erfolgt nicht in einer früher von uns diskutierten Austauschreaktion mit Pyruvat, sondern in einer direkten Reaktion: Aktiver Acetaldehyd å Acetaldehyd + TPP.1. 1. The enzymic formation of acetaldehyde from α-hydroxyethyl thiamine pyrophosphate with purified apopyrubate decarboxylase from yeast is inhibited by thiamine pyrophosphate. This inhibition explains (at least partly) the slow enzymic production of acetaldehyde from α-hydroxyethyl thiamine pyrophosphate preparations containing a considerable amount of thiamine pyrophosphate. 2. 2. The enzymic formation of acetaldehyde from α-hydroxyethyl thiamine pyrophosphate with apocarboxylase does not take place in form of an exchange reaction with pyruvate, as discussed earlier, but in form of the direct reaction: α-hydroxyethyl thiamine pyrophosphate → acetaldehyde + thiamine pyrophosphate

    Examining Publishing Trends in Academic Libraries

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    Four Sonnets by Feng Zhi

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    Translation of Feng Zhi\u27s Sonnets 6, 12, 16, and 18 by Emily Goedde

    The Dutch East Indies

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    In this presentation, I explore the effect of the Japanese invasion of the Dutch East Indies through a PowerPoint slide presentation. The Japanese invasion of the Dutch East Indies would have detrimental effects on the country and economy. American involvement would be beneficial to the Dutch East Indies unlike other times the US has been involved with other countries. Furthermore, the British put an end to the occupation of the East Indies by Japan

    From Dissidents to Institution-Builders: The Transformation of Public Interest Lawyers in South Korea

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    The nature of public interest lawyers in South Korea has transformed in recent decades. Under authoritarian rule in the 1960s, 1970s and 1980s, a sparse group of human rights lawyers defended the rights of political prisoners and laborers. With transition to democracy beginning in 1987, these lawyers formed a professional affiliation called Lawyers for a Democratic Society (Minbyun). As citizens\u27 groups and social movements blossomed in the 1990s, civic-minded lawyers began to support more specific causes such as women\u27s rights, consumer protection, environmentalism and economic justice. In 2002, Roh Moo-hyun, a Minbyun lawyer was elected President. However, public interest lawyers appear to have faded from public view since the advent of a liberal-democratic administration. This Article asks a number of questions with respect to the transformation of public interest lawyers from the 1990s to date. What makes a public interest lawyer in South Korean society? What role do they have in public interest law groups? What new implications have arisen for public interest lawyers during and after a reformist government? Why does it appear that public interest lawyers have faded from public view? This research intends to show that public interest lawyers in South Korea have gained social and political empowerment during the democratization process, and thus have become more effective, lower-profile institution-builders with respect to advancing the practice of public interest law
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