نتایج جستجو برای: diversity index
تعداد نتایج: 577656 فیلتر نتایج به سال:
This research project was executed to demonstrate a new approach increasing Sense of Belonging individuals groups which they belong. The foundation the lies in application concepts from branch math called Graph Theory. Theory provides and calculations that can be applied understand structures arise when elements interact network. considers individual humans who come together participate some ac...
The diversity and richness of species are of important components to evaluate the health of ecologic system of rangelands. This research was conducted to investigate the biodiversity in riparian and neighboring areas via comparison of indices in Javaherdeh rangeland of Ramsar. Plot-transects was randomly used to estimate diversity, richness, dominance, and evenness indices in two regions. Multi...
It is important to investigate the genetic diversity and evaluate symbiotic effectiveness of the indigenous rhizobial population. It helps understand the responses of indigenous isolates to different rhizobial inoculants. In spite of the importance of bacterial diversity, there are a few scientific reports about it in Iranian soils. Genetic diversity of 150 isolates of Sinorhizobium isolated ...
Background and Objectives: Dietary habits and nutritional behaviors of people are the food culture of every society. The aim of this study was to investigate factors, which affected food diversity in urban households of Iran. Materials & Methods: The study was carried out in a cross-sectional and analytical form on 18,627 households. Data were extracted from the Bulletin of Urban Household Ex...
The analysis of ecological diversity on a given study region constitutes a key topic in environmental studies. The quantitative aspects of ecological diversity are usually detected by means of the diversity indexes, which are ad hoc functions of the species abundance. Obviously, species abundance is unknown in practice. Hence, in order to obtain inference on diversity indexes, species abundance...
In this paper, we introduce a patch connectivity index and analyse its changes in relation to ecotope diversity and human impact intensity. Land-use maps of the newly born wetland at the Yellow River Delta of 1984, 1991 and 1996 were produced by applying an unsupervised and a supervised classification algorithm to the corresponding three scenes of Landsat Thematic Mapper (TM) images. A model fo...
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