The greedy algorithm is known to have a guaranteed approximation performance in many variations of the well-known minimum set cover problem. We analyze the number of elements covered by the greedy algorithm for the minimum set cover problem, when executed for k rounds. This analysis quite easily yields in the p-partial cover problem over a ground set of m elements the harmonic approximation gua...

Managing agricultural landscapes integrate production, biodiversity conservation and the flow of ecosystem services (ES) is paramount importance to simultaneously meet production goals environmental challenges. However, response farmland multiple ES land-use change at spatial scales remains poorly understood. We explored effects local (grassland vs. oilseed rape fields) landscape scale (cover p...

UFSMFW 2202 is an early black oat cultivar with high dry matter and grain yield potential. When used in rotation systems, the cycle has immediate advantage of allowing anticipated sowing subsequent crop. Initially, recommended for North Northwest Rio Grande do Sul.

Ground-penetrating radar (GPR) is one of the most commonly used instruments to map Snow Water Equivalent (SWE) in mountainous regions. However, some areas may be difficult or dangerous access; besides, surveys can quite time-consuming. We test a new system fulfill need speed up acquisition process for analysis SWE and access remote areas. A GPR antenna (900 MHz) mounted on drone prototype desig...

 In order to evaluate the effects of cover crops on reduced weed biomass in hybrid sunflower an experiment was carried in the research stations, Natural Resources Medicinal Plants (Samian_Ardabile) with 3 replicates in 1390-1391. The first factor was considered three type of cover crops, winter rye, spring barley, winter wheat with 2 control treatment, second factor was mulch management at two ...

The search for cultivation practices that provide productive, social and environmental benefits to the agroecosystem is of great importance sustainable intensification agriculture. objective this study was determine effect multifunctional microorganisms (MM) mix cover crops on gas exchange, production components grain yield soybean. In field experiment, conducted by two growing seasons, experim...

Ecosystem maps are foundational tools that support multi-disciplinary study design and applications including wildlife habitat assessment, monitoring and Earth-system modeling. Here, we present continuous-field cover maps for tundra plant functional types (PFTs) across ~125,000 km2 of Alaska’s North Slope at 30-m resolution. To develop maps, we collected a field-based training dataset using a p...

Grassland and shrub-steppe ecosystems are increasingly threatened by anthropogenic activities. Loss of native habitats may negatively impact important small mammal prey species. Little information, however, is available on the impact of habitat variability on density of small mammal prey species at broad spatial scales. We examined the relationship between small mammal density and remotely-sens...