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On the metric, topological and functional structures of urban networks
(2008)Physica A: Statistical Mechanics and its ApplicationsAxial Graphs are networks whose nodes are linear axes in urban space, and edges represent intersections of such axes. These graphs are used in urban planning and urban morphology studies. In this text we analyse distance distributions between nodes in axial graphs, and show that these distributions are well approximated by rescaled Poisson distributions. We then demonstrate a correlation between the parameters governing the distance ...Journal Article -
Die Einbindung von Bibliotheken in das integrative Wissenschaftskonzept
(2008)B.I.T. onlineJournal Article -
Die Unternehmensteuerreform 2008: Deutschlands Antwort auf die Globalisierung – oder doch ein Stückwerk?
(2008)ifo SchnelldienstJournal Article -
Tail estimates for sums of variables sampled by a random walk
(2008)Combinatorics, Probability & ComputingWe prove tail estimates for variables of the form P i f(Xi), where (Xi)I is a sequence of states drawn from a reversible Markov chain, or, equivalently, from a random walk on an undirected graph. The estimates are in terms of the range of the function f, its variance, and the spectrum of the graph. The purpose of our estimates is to determine the number of chain/walk samples which are required for approximating the expectation of a ...Journal Article -
Estimation of a maximum Lu diffusion rate in a natural eclogite garnet
(2008)Swiss Journal of GeosciencesJournal Article -
An optimality-based model of the coupled soil moisture and root dynamics
(2008)Hydrology and Earth System SciencesThe main processes determining soil moisture dynamics are infiltration, percolation, evaporation and root water uptake. Modelling soil moisture dynamics therefore requires an interdisciplinary approach that links hydrological, atmospheric and biological processes. Previous approaches treat either root water uptake rates or root distributions and transpiration rates as given, and calculate the soil moisture dynamics based on the theory of ...Journal Article -
Measuring the specific surface area of snow with X-ray tomography and gas adsorption: comparison and implications for surface smoothness
(2008)Atmospheric Chemistry and PhysicsChemical and physical processes, such as heterogeneous chemical reactions, light scattering, and metamorphism occur in the natural snowpack. To model these processes in the snowpack, the specific surface area (SSA) is a key parameter. In this study, two methods, computed tomography and methane adsorption, which have intrinsically different effective resolutions – molecular and 30 μm, respectively – were used to determine the SSA of similar ...Journal Article -
Post structural readings of a logico-mathematical text
(2008)Perspectives on ScienceThis paper will apply post-structural semiotic theories to study the texts of Gödel's first incompleteness theorem. I will study the texts' own articulations of concepts of ‘meaning’, analyze the mechanisms they use to sustain their senses of validity, and point out how the texts depend (without losing their mathematical rigor) on sustaining some shifts of meaning. I will demonstrate that the texts manifest semiotic effects, which we ...Journal Article -
Representativeness and climatology of carbon monoxide and ozone at the global GAW station Mt. Kenya in equatorial Africa
(2008)Atmospheric Chemistry and PhysicsThe tropics strongly influence the global atmospheric chemistry budget. However, continuous in-situ observations of trace gases are rare especially in equatorial Africa. The WMO Global Atmosphere Watch (GAW) programme aimed to close this gap with the installation of the Mt. Kenya (MKN) baseline station. Here, the first continuous measurements of carbon monoxide (CO) and ozone (O3) at this site covering the period June 2002 to June 2006 ...Journal Article -
Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP
(2008)The European Physical Journal CThe effect of the heavy b-quark mass on the two, three and four-jet rates is studied using LEP data collected by the DELPHI experiment at the Z peak in 1994 and 1995. The rates of b-quark jets and light quark jets (ℓ=uds) in events with n=2, 3, and 4 jets, together with the ratio of two and four-jet rates of b-quarks with respect to light-quarks, Rn bℓ, have been measured with a double-tag technique using the CAMBRIDGE jet-clustering ...Journal Article