Geopersia is published biannually by the College of Science, University of Tehran, Iran. The College of Science published Journal of Science, which covered all fields of basic science, from 1968 to 2010. It was then decided that the College’s journals should be more specialized, and hence publication of Geopersia was launched. Articles printed in Geopersia will be available online too. Aims an...

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the purpose of this research was to investigate the relationship between vegetation cover and soil characteristics in order to determine the most important soil factors which affect on quantitative variations and types of vegetation cover in the study area. the study area is located in west of tehran province and southeast of hashtgerd, next to najm-abad village. after field studies, the index ...

In the year 2000, exactly one hundred years after David Hilbert posed his now famous list of 23 open problems, The Clay Mathematics Institute (CMI) announced its seven Millennium Problems. (http://www. claymath.org/millennium). The Gazette has asked leading Australian mathematicians to put forth their own favourite ‘Millennium Problem’. Due to the Gazette’s limited budget, we are unfortunately ...

We study the well known vertex cover problem in various data streaming settings. Our first result considers a special family of graphs, the Vertex-Disjoint Paths (V DP ) family. We say that a graph G is in the V DP family if the edges of G are a union of vertex disjoint paths. For a V DP graph with n vertices given in a dynamic stream, in which both insertions and deletions are allowed, we prov...

Studies on vegetation changes of rangelands under grazed and non-grazedconditions are of great importance in the range management planning programs. To determinethe change process of vegetation, this study was performed in Inche Shorezar site of Golestanprovince for nine years (1997-2005). The vegetation parameters were measured every year inseveral fixed plots inside and adjacent of exclosures...

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land cover mapping is important for many planning and management activities. today, satellite images and remote sensing techniques are extensively used in all sectors including agriculture and natural resources because they provide updated data and high analyzing abilities. in this study, in order to produce land cover map for the northern part of hamedan province , digital satellite data irsp6...

409 Received July 16, 2016; Accepted February 1, 2017; Epub February 8, 2017; doi:10.14573/altex.1607161 mal Welfare Act of 1966, last amended 20132; the UK Animal Welfare Act of 20063, and the New Zealand Animal Welfare Act, 1999, last amended 20154. The issue of animal welfare is particularly pertinent for the biosciences, where there is both an ethical and legal duty to minimize the impact o...