European Ecosystems

Marcuzzi, Giorgio

doi:10.1007/978-94-009-9616-8

Cited by 9 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, s) ∼ s 1−θ−θE , which yields ρ = 1 − θ − θ E . The critical exponent θ E encodes the anomalous dimension of ϕ E and, up to O(ǫ), turns out to be [25]…”

mentioning

confidence: 99%

Collective non-equilibrium dynamics at surfaces and the spatio-temporal edge

Marcuzzi

Gambassi

Pleimling

2012

EPL

View full text Add to dashboard Cite

Symmetries represent a fundamental constraint for physical systems and relevant new phenomena often emerge as a consequence of their breaking. An important example is provided by spaceand time-translational invariance in statistical systems, which hold at a coarse-grained scale in equilibrium and are broken by spatial and temporal boundaries, the former being implemented by surfaces -unavoidable in real samples -the latter by some initial condition for the dynamics which causes a non-equilibrium evolution. While the separate effects of these two boundaries are well understood, we demonstrate here that additional, unexpected features arise upon approaching the effective edge formed by their intersection. For this purpose, we focus on the classical semi-infinite Ising model with spin-flip dynamics evolving out of equilibrium at its critical point. Considering both subcritical and critical values of the coupling among surface spins, we present numerical evidence of a scaling regime with universal features which emerges upon approaching the spatio-temporal edge and we rationalise these findings within a field-theoretical approach.PACS numbers: 64.60. De, 64.60.Ht, 68.35.Rh Introduction -Thanks to the advances in miniaturisation of the past decades, devices have reached a size at which boundary effects cannot be neglected; in parallel, the physics of surfaces and interfaces has attracted an increasing interest, in particular concerning non-equilibrium dynamical processes, as many applications involve sudden changes in control parameters. Typically, describing these processes requires knowledge of the many microscopic details that vary widely from system to system. However, in suitable circumstances, collective phenomena emerge which make only few coarse-grained, mesoscopic properties relevant for the dynamics: in fact, it is now well-established, both theoretically and experimentally, that the behaviour of a statistical system close to a continuous phase transition can be characterised by few quantities, such as exponents and scaling functions, which depend only on the range and symmetries of the underlying interaction and on the dimensionality of the space. All the microscopically different systems sharing these same gross features form the so-called universality class of the transition. Within each of these classes, the various thermodynamic and structural properties typically show, in the neighbourhood of the critical point, leading algebraic behaviours characterised by common exponents, which constitute the hallmark of the transition. In turn, upon approaching it, the relevant contribution to the various thermodynamic quantities is effectively determined by the fluctuations of the so-called order parameter ϕ (e.g., the local magnetisation for an Ising ferromagnet).

show abstract

“…, s) ∼ s 1−θ−θE , which yields ρ = 1 − θ − θ E . The critical exponent θ E encodes the anomalous dimension of ϕ E and, up to O(ǫ), turns out to be [25]…”

mentioning

confidence: 99%

Collective non-equilibrium dynamics at surfaces and the spatio-temporal edge

Marcuzzi

Gambassi

Pleimling

2012

EPL

View full text Add to dashboard Cite

show abstract

“…Considered as glacial relics, they are found at high altitudes (2300-2400 m), for example in the Austrian (Oetzal) and Italian [16]. Alps and constitute pioneer riparian species colonizing areas liberated by the retreat of glaciers [17,18,19]. Although with highly developed membranous wings, folded under the elytra (Figure 1), their ability to fly is unknown.…”

Section: Ubiquitary Nebriamentioning

confidence: 99%

Nebria Species (Subfamily Nebriinae, Family: Carabidae) from the Romanian Carpathians. Morphological and Molecular Data

Barloy

Prunar

Dreano

et al. 2017

Advanced Research in Life Sciences

View full text Add to dashboard Cite

Among the ten species of the Nebria genus, present in the Romanian Carpathians, seven are the object of morphological, geographical distribution and molecular biological studies: Nebria (Eunebria) jockischi hoepfneri Dejean, 1826, Nebria (Boreonebria) heegeri Dejean, 1826, Nebria (Boreonebria) gyllenhali Schönherr, 1806, Nebria (Alpaeonebria) reichei Dejean, 1826, Nebria (Alpaeonebria) reitteri Rybinsky, 1902, Nebria (Alpaeonebria) bissenica Bielz, 1887, Nebria (Nebria) transsylvanica Germar, 1824, Nebria (Nebria) femoralis alpigrada Csiki 1905), collected from the Maramureș Mt., Rodnei Mt., Parâng Mt., Rarău Mt., Făgăraș Mt., Cozia Mt., Bucegi Mt., Retezat Mt., Muntele Mic and Semenic Mt. The morphological description exploits the body size, the elytral reflection, the colour of the appendages and the legs, the shape of the first antennary segment, its chaetotaxy and that of the submentum, the shape and size of the elytra and alae, the position of the bristles on the ventrites 4-5-6. The shape of the first antennary segment and its chaetotaxy appear as more discriminating criteria, but supposes the integrity of the bristles. The identification is sometimes malaise due to the fragility of the bristles (first antennomere, submentum). Nebria (Alpaeonebria) reichei Dejean, 1826 has a variable chaetotaxy of antenna, 1 to 3 bristles on the first antennomere. The individuals with yellow appendages and legs provided with 2 unequal length can be confused with transsylvanica. They are distinguished by the triangular shape of the aileron (S-shaped in transsylvanica). Molecular data are given for the first time on Carpathian Nebria. The mitochondrial markers (COI I, cyt b) clearly identify the species studied and confirm that alpigrada does not belong to transsylvanica. The results show an infraspecific variability of geographic and altitudinal origin in jockischi one of the most widespread species (gyllenhali, jockischi, reichei).

show abstract

“…Ranges which contain subalpine forests include the Alps (Marcuzzi, 1979), the Pyrenees (Plesnik, 1972), the Juras, Balkans and Pirins, some ranges in Turkey [Mt Ararat -5165 m (16 946 ft)] , the Carpathians, Caucasus (Henning, 1972), and the Urals, among others. A detailed vegetation map of much of western Europe is available (Ozenda et al, 1979).…”

Section: Asiamentioning

confidence: 99%

“…Thus, meadows contain Epilobium, Potentilla, Delphinium, Pedicularis, Lonicera, Senecio, Euonymus, Artemisia, Fest uca, etc., invaded by alders (Alnus), birches (Betula), mountain ash (Sorbus), or popular (Populus), and finally, by spruce and firs in Europe (Berg, 1950;Marcuzzi, 1979) and Asia (Wang 1961;Numata, 1974). We should note that from one place to another the same subalpine species may be climax in one environment and successional in another.…”

Section: Mexicomentioning

confidence: 99%

“…Lizards are not generally found in the subalpine, though the viviparous lacertid (Lacerta vivipara) occurs up to 3000 m in the Alps. Subalpine snakes include vipers, e.g., Vipera berus, K ammodytes and K aspis in Europe (Marcuzzi, 1979) and K raddei in Soviet Asia (Terent ev and Chernov, 1965), and the widely distributed grass snakes, especially Natrix natrix.…”

Section: Mexicomentioning

confidence: 99%

See 1 more Smart Citation