2,556 research outputs found
On the formation of elliptic stones due to periodic water waves
No full textOn the beaches of the oceans may be found amongst many stones with irregular shapes also stones that are nearly perfect ellipsoids. In this work, two grinding processes in the surf for stones of ellipsoidal shape are described mathematically on the basis of simple physical models. The first process is the abrasion of material perpendicular to the shortest axis of the stone sliding on the sand of the beach. The model explains the experimental fact that oblong stones with small b/a-ratios as a rule are slim stones with a small c/a-ratio. The second process is connected with a rolling motion around the axis of the largest moment of inertia, which leads to an effective grinding on a surface strip perpendicular to the ab-plane. The corresponding calculation yields a criterion for the form stability of the ellipsoid. The obtained result is virtually identical with the experimentally observed maximum of the error distribution function for the b/a-ratio
Beiträge von Klaus Graf in anderen Hypotheses-Blogs
No full text36 Beiträge in Ordensgeschichte https://ordensgeschichte.hypotheses.org/author/klaus/page/2 21 im Redaktionsblog: https://redaktionsblog.hypotheses.org/author/klaus/page/2 4 in Heraldica Nova https://heraldica.hypotheses.org/author/klaus 4 in Geschichte Bayerns https://histbav.hypotheses.org/author/klaus 1 in Digitale Geschichtswissenschaft https://digigw.hypotheses.org/1063 Macht 66. Nicht mitgezählt die von mir administrierten Blogs https://frueheneuzeit.hypotheses.org/ https://kulturgut.hy..
On the ocean beach—why elliptic pebbles do not become spherical
No full textAmong pebbles strewn across a sandy ocean beach, one can find relatively many with a nearly perfect elliptical (ellipsoidal) shape, and one wonders how this shape was attained and whether, during abrasion, the pebbles would remain elliptical or eventually become spherical. Mainly the latter question was addressed in a previous publication which identified frictional sliding and rotation of an elliptic pebble as main abrasion processes in the surf waves. In particular, it was predicted that the ellipticity ε={1−b2/a2}1/2
(a > b, principal ellipse axes) converges to a common equilibrium value for elliptic-like pebbles. Unfortunately, the derivation was based on an invalid force expression and a dimensionally unsuitable curvature. In this paper, not only force and curvature but also the contact duration with the sand surface during rotations is taken into account by fairly simple physical arguments, and it is shown that elliptic pebbles neither approach the same ellipticity and nor become more spherical nor more disk-like but rather that the ellipticity ε
increases.Georg-August-Universität Göttingen (1018
On the mathematical work of Klaus Floret
No full textIn section 1 of this article, a sketch of the life and the career of Klaus Floret is given. Then,in sections 2 to 5, the author reports on the part of the mathematical work of Klaus Floret which was devoted to four important topics in functional analysis in which Klaus worked and in which considerable progress was achieved during his lifetime. These topics are: locally convex inductive limits; bases and approximation properties; - -spaces and the "probleme des topologies"; tensor norms, operator ideals, spaces of polynomials. Some of the history of these topics is included, sometimes together with an account of some of the leading figures in the field. A prelude, an interlude and a coda present related remarks which do not fit in the main body of the article
Specificity and definiteness in sentence and discourse structure
No full textIn this paper, I argue that this informally given list of characteristics covers only a certain subclass of specific indefinites. […] In particular, I dispute the definition of specific indefinites as "the speaker has the referent in mind" as rather confusing if one is working with a semantic theory. Furthermore, I discuss "relative specificity", it. cases in which the specific indefinite does not exhibit wide, but intermediate or narrow scope behavior. Based on such data, I argue that specificity expresses a referential dependency between introduced discourse items. Informally speaking, the specificity of the indefinite expression something [...] expresses that the reference of the expression depends on the reference of another expression, here, on the expression a monk, not the speaker
Vaclav Klaus and "nature"
No full textThesis is based on the views of authors of sociology of knowledge (Berger, Luckman, Bourdieu) and authors of discourse analysis (Foucault, Fairclough). The central assumption is that knowledge is socially constructed and that this construction has its strong ideological and hierarchic aspects. Author is analyzing books and texts of Vaclav Klaus using the critical discourse analysis. Author is convinced that Vaclav Klaus has a substantive influence on public opinion in Czech Republic. Also author is convinced the struggle in the discussion over environmental topics is based in different basic assupmtions of discussion participant. Thus author decided to analyse the Vaclav Klaus's basic assumptions for the notions of nature and environment
Meine Blogs
No full textAußer an Archivalia arbeite ich an folgenden Blogs mehr oder minder regelmäßig mit: http://log.netbib.de/archives/author/kg Seit 2001 arbeite ich dort mit (Archivalia gibt es seit 2003) http://frueheneuzeit.hypotheses.org/author/klaus Seit 2010 (AGFNZ-Blog), siehe http://frueheneuzeit.hypotheses.org/902 http://redaktionsblog.hypotheses.org/author/klaus Seit 2012 http://ordensgeschichte.hypotheses.org/author/klaus Seit 2012 http://kulturgut.hypotheses.org/author/klaus Seit Ende 2012 http://her..
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