Let C+ := {s ∈ C | Re(s) ≥ 0} and let A denote the ring A = ( s(∈ C+) 7→ b fa(s) + ∞ X k=0 fke −stk ̨̨̨̨ fa ∈ L(0,∞), (fk)k≥0 ∈ `, 0 = t0 < t1 < t2 < . . . ) equipped with pointwise operations. (Here b· denotes the Laplace transform.) It is shown that the ring A is not coherent, answering a question of Alban Quadrat [6, p. 30]. In fact, we present two principal ideals in the domain A whose intersec...

Livestock grazing practices in rangelands are being recognized as management tool for environmental protection and increased livestock productivity. Continuous grazing has been largely reported to reduce pasture productivity and increase environmental degradation. Rotational grazing is an alternative to continuous grazing and is considered to reduce negative environmental effects and provide qu...

Abstract This paper presents a quantitative account of vegetation–environmental factor relationships in arid rangelands. Vegetation cover was recorded using Braun-Blanquet combined abundance-cover scale in each quadrat. Within each quadrat, one profile was dug and soil samples being taken at 0-20cm and 20-100cm depths. Under study physical-chemical characteristics included texture, lime, orga...

In ecology and epidemiology, spatio-temporal distributions of events can be described by Cox processes. Situations for which there exists a hidden process which contributes to random effects on the intensity of the observed Cox process are considered. The observed process is a generalized shot noise Cox process and the hidden process is a Poisson process associated with a Dirichlet process. The...

The processes that structure assemblages of species in hyper-diverse genera, such as Ficus (Moraceae), are not well understood. Functional diversity of co-occurring species can reveal evidence for assembly processes; however, intraspecific variation may weaken species-level patterns. We studied whether functional and phylogenetic diversity of Ficus species indicated the effects of spatial varia...