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Parameterisierung atmosphärischer Grenzschichtprozesse in einem regionalen Klimamodell der Arktis
(1998)
We study spatially localized excitations in a lattice of coupled standard maps. Time-periodic solutions (breathers) exist in a range of coupling that is shown to shrink as the period grows to infinity, thus excluding the possibility of time-quasiperiodic breathers. The evolution of initially localized chaotic and quasiperiodic states in a lattice is studied numerically. Chaos is demonstrated to spread
We prove the existence of nonlinear localized time-periodic solutions in a chain of symplectic mappings with nearest neighbour coupling. This is a class of systems whose behaviour can be seen as representation of a lattice of pendula. The effect of discrete time changes the mathematical as well as the numerical procedures. Applying the discrete version of Floquet theory eases and clarifies the procedure of proving the existence of the localized time-periodic solutions. As an extension of the concept of rotobreathers one can produce solutions which rotate at every site of the lattice. To consider these we use a general definition of localization.
Ästhetische Intelligenz
(1998)
Beik, W., Urban protest in seventeenth century France; Cambridge, Cambridge Univ. Press, 1997
(1998)
On the basis of a stochastic model of hopping transport in disordered solids we present results of simulations of the dark discharge of surface charged thin films considering the energetic distribution of the localised states within the sheet. A non- linear differential equation with suitable boundary and initial conditions describes the time evolution of the space charge. We suppose a Gaussian distribution of energies for the carrier transporting states with a standard deviation s. The arrival time of carriers at the rear electrode of the sandwich sample is studied in dependence on film thickness, initial surface charge, and energetic disorder. Our calculations confirm that the transit time increases indirect proportional with initial surface charge and proportional with the square thickness. For standard deviations of energetic distribution of 0.05 eV up to 0.25 eV the normalised transit time grows as s1.44. We discuss this in terms of the stochastic transport model.
Spitzensport, soziale Ungleichheit und soziale Reproduktion im deutsch-französischen Vergleich
(1998)
The Frolikha Fan : a large Pleistocene glaciolacustrine outwash fan in northern Lake Baikal, Siberia
(1998)
The paper describes three stages of the privatisation process in Bulgaria 1990-1997. In the first period (1990-1993) progress was very slow. Only after 1993 a significant privatisation started. Mainly retail shops, restaurants and small businesses of various kinds were sold. In 1996 a programme for mass-privatisation was launched which has led to a widespread share-ownership in Bulgaria.
All countries of Central and Eastern Europe had to bear and are still bearing tremendous costs of the economic and political transformation. This paper deals with the case of Bulgaria. We describe the social situation and the most important social security institutions in Bulgaria (unemployment benefits, the pension system and family support) over the period of the last seven years.
Inhalt: Grundgedanken zur Entwicklung von Leitbildern -Leitbilder im Kontext eines Stadtmarketingkonzeptes -Ein Modell zur Entwicklung von Leitbildern -Das Leitbild als ein Element der Entwicklung eines Stadtmarketing- Konzepts -Funktion von Leitbildern -Anforderungen an Leitbilder Beispiele zur Leitbildentwicklung für die Städte Hennigsdorf und Potsdam
Intervention
(1998)
Gades
(1998)
Die Phokäer im Westen
(1998)
Gerunda, heute Gerona
(1998)
Gigurri
(1998)
Hannibal
(1998)
Hispalis, heute Sevilla
(1998)
Iberische Germani
(1998)
Iberus, heute Ebro
(1998)
Iberus, heute Rio Tinto
(1998)
Ilerda
(1998)
Ilipa, heute Alcalá del Rio
(1998)