نتایج جستجو برای: percentage of total changes and annual forest changes area estimted
تعداد نتایج: 24142695 فیلتر نتایج به سال:
in this investigation, using mann â kendall graphical-statistical test, which is one of the proposed methods of world meteorological organization (wmo) for time series analysis, the change trend of long â term mean of annual minimum and maximum temperatures in iran will be studied. to evaluate this trend and access a suitable pattern in this situation, average of annual minimum and maximum ...
wireless sensor networks (wsns) are one of the most interesting consequences of innovations in different areas of technology including wireless and mobile communications, networking, and sensor design. these networks are considered as a class of wireless networks which are constructed by a set of sensors. a large number of applications have been proposed for wsns. besides having numerous applic...
converting rangelands to arable land such as dry farming is widely practiced in many places in iran. this activity could possibly contribute to the increase in downstream sedimentation. the effects of this activity on downstream watersheds are not well documented for many strategic areas in the country. one such area which is proposed for this study is the kardeh drainage basin, located in the ...
Ceratium hirundinella is considered as a biological indicator in the environmental and climate changes. In the summer of 2018, the presence of Ceratium hirundinella reported in the Iranian region of the Caspian Sea. So the present study conducted to survey trend of Ceratium hirundinella fluctuations in the Iranian basin of the Caspian Sea during the last 3 decay. The study showed that in the wi...
Land use/cover change is one of the main factors in environmental changes. The changes directly affect the value of ecosystem services. The purpose of this research is to evaluate the effect of land use/land cover change in the Kashkan area on its ecosystem services. This research was carried out in three stages, including the analysis of land cover changes, prediction of changes, and carbon st...
Tropical Africa is affected by intense land-use change, particularly forest conversion to agricultural land. In this study, the stream discharge of four small headwater catchments located within an area of 6 km in western Kenya was examined for 2 years (2007 and 2008). The four catchments cover a degradation gradient ranging from intact forest to agricultural land under maize cultivation for 5,...
the objective of this study is to investigate of climate change in gorgan river-gharesoo basin and these impacts of this phenomenon on regional land use change, as well as provide guidance on the effective management and conservation of natural land area. analysis of climate data including rainfall, average temperature and relative humidity of nine synoptic stations in this area from east to we...
hedging is a multi-purpose rhetorical strategy which is usually used in scientific arguments to secure ratification of claims, reduce the risk of negation, avoid conflict, manage disagreement and leave room for the audience to assess presented information. hedges are frequently used in research articles to mitigate the findings of research endeavors. the present research aims to investigate the...
the issue of curriculum and syllabus evaluation and revision has been in center of attention right from when curriculum came into attention of educational institutions. thus everywhere in the world in educational institutions curricula and syllabi are evaluated and revised based on the goals, the needs, existing content, etc.. in iran any curriculum is designed in a committee of specialists and...
the purpose of the present study is to find out whether bilinguals of khuzestan-arab origin or monolinguals of iranian origin code-switch during learning or speaking english and which group is more susceptible to code-switch. to this end, the students of 24 classes from high schools and pre- university centers were screened out, and interviewed and their voices and code-switchings were recorded...
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