Ageing in bosonic particle-reaction models with long-range transport

Ageing in systems without detailed balance is studied in bosonic contact and pair-contact processes with Levy diffusion. In the ageing regime, the dynamical scaling of the two-time correlation function and two-time response function is found and analysed. Exact results for non-equilibrium exponents and scaling functions are derived. The behaviour of the fluctuation-dissipation ratio is analysed. A passage time from the quasi-stationary regime to the ageing regime is defined, in qualitative agreement with kinetic spherical models and p-spin spherical glasses.Comment: Latex2e, 24 pages, with 9 figures include

Long-range transport of PM10 : Part 2.

The purpose of this study is to identify long-range transport patterns that may have an important influence on PM10 levels in four European cities at different latitudes, namely those in Thessaloniki, Szeged, Helsinki and Oulu. Trajectory positions were computed using the HYSPLIT model. 4-day, 6-hourly 3D backward trajectory positions arriving at these locations at 1200 GMT were determined for each day over a 5-year period from 2001 to 2005. Non-hierarchical cluster analysis with the k-means method was applied using a Mahalanobis metric. The efficiency of the 2D and 3D cluster analyses were compared for each city

Directed transient long-range transport in a slowly driven Hamiltonian system of interacting particles

We study the Hamiltonian dynamics of a one-dimensional chain of linearly coupled particles in a spatially periodic potential which is subjected to a time-periodic mono-frequency external field. The average over time and space of the related force vanishes and hence, the system is effectively without bias which excludes any ratchet effect. We pay special attention to the escape of the entire chain when initially all of its units are distributed in a potential well. Moreover for an escaping chain we explore the possibility of the successive generation of a directed flow based on large accelerations. We find that for adiabatic slope-modulations due to the ac-field transient long-range transport dynamics arises whose direction is governed by the initial phase of the modulation. Most strikingly, that for the driven many particle Hamiltonian system directed collective motion is observed provides evidence for the existence of families of transporting invariant tori confining orbits in ballistic channels in the high dimensional phase spaces

Long range transport of ultra cold atoms in a far-detuned 1D optical lattice

We present a novel method to transport ultra cold atoms in a focused optical lattice over macroscopic distances of many Rayleigh ranges. With this method ultra cold atoms were transported over 5 cm in 250 ms without significant atom loss or heating. By translating the interference pattern together with the beam geometry the trap parameters are maintained over the full transport range. Thus, the presented method is well suited for tightly focused optical lattices that have sufficient trap depth only close to the focus. Tight focusing is usually required for far-detuned optical traps or traps that require high laser intensity for other reasons. The transport time is short and thus compatible with the operation of an optical lattice clock in which atoms are probed in a well designed environment spatially separated from the preparation and detection region.Comment: 14 pages, 6 figure

Arctic Haze: Meteorological Aspects Of Long-Range Transport

Thesis (Ph.D.) University of Alaska Fairbanks, 1983A time series of concentrations of pollution aerosols collected over a period of four years in the near-surface air at Barrow, Alaska, was used to investigate tropospheric long-range transport of anthropogenic pollution from mid-latitudes into the Arctic. This transport takes place when the mid-latitudinal and arctic atmospheric circulations remain in a quasi-persistent mode. Sudden changes in the circulation pattern explain the episodic character of the arctic pollution aerosol. Transport of aerosols is accomplished by quasi-stationary anticyclones and takes place along their peripheries where pressure gradients are relatively strong. The seasonal variation in concentration of the arctic pollution aerosol is explained by the seasonal variation in the occurrence and position of mid-latitude blocking anticyclones, of the arctic anticyclone, and of the Asiatic anticyclone. The positions of the major anticyclonic centers are responsible for the fact that Soviet industrial sources contribute to the arctic pollution aerosol predominantly during winter, European sources during spring, and that North American and Far Eastern industrial sources contribute little to the arctic pollution aerosols. Air masses carrying pollutants can be traced by their chemical characteristics obtained over the source regions, however, the original meteorological characteristics are lost during the transport which lasts for about 8-9 days. A second data set, collected during the "Ptarmigan" weather reconnaissance flights, was investigated for observations of Arctic Haze over the Alaskan Arctic. A connection between Arctic Haze and the arctic pollution aerosols is suggested, for the occurrence of Arctic Haze undergoes a similar seasonal variation as that of the pollution aerosols, and similar circulation modes leading to the Soviet Union and Europe can be found during the presence of Arctic Haze. In addition, the data seem to suggest that besides a probable pollution-derived component during winter/spring Arctic Haze might be desert dust-derived during summer