نتایج جستجو برای: spatial variability

تعداد نتایج: 481155  

This research was conducted to investigate spatial variability and estimate tree attributes in a plantation forest in the Caspian region of Iran using geostatistical analysis. Sampling was performed based on a 50m?125m systematic grid in a maple stand (Acer velutinum Boiss) 18 years of age using circular samples of 200m2 area. Totally, 96 sample plots were measured in 63 hectares and 14.25 he...

ژورنال: علوم آب و خاک 2010
افیونی, مجید, صدر, سمیه, فتحیان پور, نادر,

Industrial, agricultural and urban activities have contaminated soil by heavy metals that can also increase concentration of the metals in food chains. This study was carried out in Isfahan province where lots of such activities are in progress. The purpose of this study was to determine spatial variability of Arsenic )As) in Isfahan soils. In this research, the soil samples )0-20 cm) were coll...

2012
Chris Brunsdon

however, it is not always clear what ‘near’ means in this context. The simplest definition, if the data being analysed consists of spatial point data, is to work with Euclidean (or straight line) distances however this is not always a reliable indicator of proximity. A number of alternative measures of proximity are possible for example travel times or travel distances based on routes on roads ...

2013
Filippo Saiano Giacomo Oddo Riccardo Scalenghe Tommaso La Mantia Franco Ajmone-Marsan

A fast and accurate measurement of soil carbon is needed in current scientific issues. Today there are many sensors suitable for these purposes, but choosing the appropriate sensor depends on the spatial scale at which the studies are conducted. There are few detailed studies that validate these types of measures allowing their immediate use. Here it is validated the quick use of a sensor in ex...

2010
G. Darrel Jenerette Russell L. Scott Alfredo R. Huete

Questions: We asked several linked questions about phenology and precipitation relationships at local, landscape, and regional spatial scales within individual seasons, between seasons, and between year temporal scales. (1) How do winter and summer phenological patterns vary in response to total seasonal rainfall? (2) How are phenological rates affected by the previous season rainfall? (3) How ...

ژورنال: علوم آب و خاک 2014

Shahrekord groundwater is the main source of water for drinking, and the agricultural and industrial activities of its inhabitants. Water quality measures of scaling and corrosion can deteriorate steel-based systems used for storage or supplying water for drinking and to industry and irrigation. The main aim of this study was to assess the spatial variability and mapping of scaling and corro...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه امام رضا علیه السلام - دانشکده زبانهای خارجی 1391

abstract this study tried to investigate whether there was any significant relationship between technical translation quality of the senior english translation students and their levels of verbal-linguistic, visual-spatial and interpersonal intelligences. in order to investigate the research questions, the researcher selected a hundred senior english translation students from three universitie...

Journal: :فیزیک زمین و فضا 0
طیب رضیئی استادیار، پژوهشکده حفاظت خاک و آبخیزداری کشور، تهران، ایران ابراهیم فتاحی استادیار، گروه هواشناسی آب شناسی، پژوهشکده هواشناسی، تهران، ایران

drought monitoring, which is a crucial component of drought management, aims to provide information that enables and supports people and organizations to take actions to reduce potential drought-related impact and damage. we usually tend to focus on drought when it is occurring and to react when crises strike. however, recent experiences and developments on drought knowledge are encouraging soc...

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