11,931 research outputs found
Effects of reduced-impact logging on medium and large-bodied forest vertebrates in eastern Amazonia
Standard line-transect census techniques were deployed to generate a checklist and quantify the abundance of medium and large-bodied vertebrate species in forest areas of eastern Amazonia with and without a history of reduced-impact logging (RIL). Three areas were allocated a total of 1,196.9 km of line-transect census effort. Sampling was conducted from April to June 2012 and from April to August 2013, and detected 29 forest vertebrate species considered in this study belonging to 15 orders, 20 families and 28 genera. Additionally, eight species were recorded outside census walks through direct and indirect observations. Of this total, six species are considered vulnerable according to IUCN (Ateles paniscus, Myrmecophaga tridactyla, Priodontes maximus, Tapirus terrestris, Tayassu peccary, Chelonoidis denticulata). Observed species richness ranged from 21 to 24 species in logged and unlogged areas, and encounter rates along transects were highly variable between treatments. However, the relative abundance of species per transect did not differ between transects in logged and unlogged forests. Of the species  detected during censuses, only three showed different relative abundance between the two treatments (Saguinus midas, Tinamus spp. and Dasyprocta leporina). Our results show that the effect of RIL forest management was a relatively unimportant determinant of population abundance for most medium and large vertebrates over the time period of the survey
Renormalization group approach to a -wave superconducting model
We present in this work an exact renormalization group (RG) treatment of a
one-dimensional -wave superconductor. The model proposed by Kitaev consists
of a chain of spinless fermions with a -wave gap. It is a paradigmatic model
of great actual interest since it presents a weak pairing superconducting phase
that has Majorana fermions at the ends of the chain. Those are predicted to be
useful for quantum computation. The RG allows to obtain the phase diagram of
the model and to study the quantum phase transition from the weak to the strong
pairing phase. It yields the attractors of these phases and the critical
exponents of the weak to strong pairing transition. We show that the weak
pairing phase of the model is governed by a chaotic attractor being non-trivial
from both its topological and RG properties. In the strong pairing phase the RG
flow is towards a conventional strong coupling fixed point. Finally, we propose
an alternative way for obtaining -wave superconductivity in a
one-dimensional system without spin-orbit interaction.Comment: 14 pages and 4 figures, to appear in Physics Letters
New sizes of complete arcs in PG(2,q)
New upper bounds on the smallest size t_{2}(2,q) of a complete arc in the
projective plane PG(2,q) are obtained for 853<= q<= 2879 and q=3511,4096,
4523,5003,5347,5641,5843,6011. For q<= 2377 and q=2401,2417,2437, the relation
t_{2}(2,q)<4.5\sqrt{q} holds. The bounds are obtained by finding of new small
complete arcs with the help of computer search using randomized greedy
algorithms. Also new sizes of complete arcs are presented.Comment: 10 page
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