In this paper, the LogP model is used to analyze four parallel sorting algorithms (bitonic, column, radix, and sample sort). LogP characterizes the performance of modern parallel machines with a small set of parameters: the communication latency (L), overhead (o), bandwidth (g), and the number of processors (P ). We develop implementations of these algorithms in Split-C, a parallel extension to...

If the fth dimension is one-dimensional connected manifold, up to diieo-morphic, the only possible space-time will be M =Z 2. And there exist two possibilities on cosmology constant: the cosmology constant is constant along the fth dimension, and the cosmology constant is sectional constant along the fth dimension. We construct the general models with parallel 3-branes on those kinds of the spa...

Line transect surveys are widely used to estimate the density and/or size of cetacean populations. Good survey design is essential for obtaining reliable results using standard (design-based) analysis methods. Even more complex (model-based) methods, a good valuable. A ‘good’ one (a) that employs randomisation in laying out transects; (b) stratified if known vary on large scale; (c) where each ...

Invasive plant species pose a serious threat to agricultural yield, although how the varies with distance of crops from invasive plants remains unclear. Therefore, utilizing this viewpoint, objectives were formulated quantify differences in native vegetation and performance growing near A. adenophora–invaded (treatment plots) uninvaded ridges (control terraced fields Kumaun Central Himalaya. Mo...

The effect of soil contamination by polycyclic aromatic hydrocarbons (PAH) and heavy metals on earthworms and enchytraeids was studied in urban parks, in Brno, Czech Republic. In spring and autumn 2007, annelids were collected and soil samples taken in lawns along transects, at three different distances (1, 5 and 30 m) from streets with heavy traffi c. In both seasons, two parks with two transe...

European earthworms are invading previously worm-free hardwood forests across Minnesota and the Great Lakes region. In many of these forests, earthworm invasions have been associated with the loss of a previously thick forest floor. The ability of earthworms to alter and control ecosystem processes has been demonstrated in agricultural systems, but the dynamics and impact of these invasions in ...

the aim of this research was to investigate the effect of index species, astragalusammodendron on the associated plants of agropyron tauri and bromus tomentellus fromdifferent aspects in shazand rangeland in southwest of markazi province. the effects ofspecies density and distribution pattern and then index species on the soil properties werestudied. based on the randomized – systematic method,...