نتایج جستجو برای: simpson index was used
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‘romanticism’ and ‘romantic’ are among the most controversial terms in literature. most readers, when encountering these words, would think of the well-known period of romanticism of the first three decades of the nineteenth century and the great six english poets known as ‘the big six’ of this period. however, romanticism does not belong to certain artists in a special period; one may seek ele...
Microzooplankton plays an important role in aquatic food web and they act as trophic intermediates between the phytoplankton and higher trophic levels. The purpose of this investigation was to study the ecological situation of bahmanshir base on biological indexes calculation. Biological indexes of zooplankton in coastal region of bahmanshir waters were investigated. Samples were collected usin...
aim of this research was evaluated and compared of density (number tree per hectare), basal area and volume characteristics for estimation of tree species diversity in degraded forests. in order to, 73 hectares of kouhmian forests was inventory based on random systematic pattern with circular plots (10r and 26 plots). in each plot species, dbh and number of tree were measured and recorded. to e...
introduction: diabetes mellitus is an growing national and international public health concern. the number of people affected by diabetes in world by 2030 will be 69% in developing countries. regular physical activity plays a key role in the management of type 2 diabetes melitus, particularly glycemic control. it has been recommended that peoples with type 2 diabetes participate in moderate-int...
in this study, we considered an inflationary inventory control model under non-deterministic conditions. we assumed the inflation rate as a normal distribution, with any arbitrary probability density function (pdf). the objective function was to minimize the total discount cost of the inventory system. we used two methods to solve this problem. one was the classic numerical approach which turne...
Biological indexes of zooplankton in coastal region of Bahrakan waters- Hendijan harbor were investigated. samples were collected using plankton net (45 cm and mesh size of 100 μm) during July, August, October of 2010 and December, February, April of 2011.Mean of Shannon diversity index was (1.95) over the year and the min of Margalef species richness was (0.98). The highest value of these inde...
Global climate change has led to more frequent and severe droughts, which can negatively affect instream invertebrate communities, but we lack a perspective on the global patterns drivers of such drought effects. Here, using meta-analysis, synthesized 997 paired observations extracted from 94 peer-reviewed publications assess how affects biomass, density, taxonomic richness, diversity (Shannon–...
Information of vegetation structure and composition terrestrial flora biodiversity can be measured by analysis method. The method requires sampling plots as a measurement plot capable to describe species in forest stand. distribution diversity, especially plants, is relatively dependent on the type plant with condition area it occupies. Therefore, an efficient representative needed for ecosyste...
Uneven-aged forest management has received increasing attention in the past few years. Compared with even-aged plantations, the complex structure of uneven-aged forests complicates the formulation of management strategies. Forest structural diversity is expected to provide considerable significant information for uneven-aged forest management planning. In the present study, we investigated the ...
fuzzy newton-cotes method for integration of fuzzy functions that was proposed by ahmady in [1]. in this paper we construct error estimate of fuzzy newton-cotes method such as fuzzy trapezoidal rule and fuzzy simpson rule by using taylor's series. the corresponding error terms are proven by two theorems. we prove that the fuzzy trapezoidal rule is accurate for fuzzy polynomial of degree one and...
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