land cover map is important for many urban planning and management activities. in this study, in order to produce land cover map of arak city, digital image of liss-iii scanner acquired on 16 june 2006 were employed. first of all, geometric correction with rmse 0.58 pixel was applied. considering the mountainous condition of the study area, topographic correction was applied to the image. in su...

divided into three major areas: the coast, the central valleys, and the river basins. Rainfall is less than in the Gulf Coast region, averaging from 20 to 60 inches annually. The important indigenous grasses are Hilaria semplei, H. cenchroides, Bouteloua filiformis, B. curtipendula, Cathestecum erectum, C. multifidum, Opixia stolonifera, Heteropogon contortus, Panicum spp., Paspalum spp., E I y...

Counting the number of ground states for a spin-glass or nondeterministic polynomial-complete combinatorial optimization problem is even more difficult than the already hard task of finding a single ground state. In this paper the entropy of minimum vertex covers of random graphs is estimated through a set of iterative equations based on the cavity method of statistical mechanics. During the it...

Vineyards are likely to be regionally important for wildlife, but we lack biodiversity studies in this agroecosystem which is undergoing a rapid management revolution. As vine cultivation is restricted to arid and warm climatic regions, biodiversity-friendly management would promote species typical of southern biomes. Vineyards are often intensively cultivated, mostly surrounded by few natural ...

Aim The biotic resistance hypothesis posits that greater native species richness limits invasions of exotic species. However, negative native-exotic relationships (NERRs) may reverse with increasing spatial scale, seemingly refuting the hypothesis. Here, we explore effects competitive interactions, environmental factors, habitat heterogeneity and vertical vegetation tiers on NERRs across scales...

The potential problems and their consequences due to fly ash disposal have been well studied around the world. Ash pond is a common available disposal facility for thermal power plants. The pond ash is subjected to weathering and the ions present in ash migrate to the soil and subsequently to the ground water over a period of time. A study has been carried out at Vijayawada Thermal Power Statio...

Our description of the cytosolic binding activity and subsequent isolation and characterization of a specific intestinal fatty acid bindingproteus (FABP) have largely withstood the test of time and have generated new questions. One of my coauihors, Joan A. Manning, remains a memberof the research teem; her excellent contributions have played a major role in iii subsequent accomplishments. Altho...

Many land-management agencies are caught between decreased budgets and increasing public interest. Furthermore, semi-arid landscapes are sensitive to management prescriptions and use, and require a significant amount of monitoring in order to assess vegetation productivity and health. The purpose of this study was to evaluate the use of Landsat Enhanced Thematic Mapper (ETM) Imagery to monitor ...