نتایج جستجو برای: temporal trends

تعداد نتایج: 385123  

Journal: :international journal of environmental research 2015
a. de santiago-martín j.r. quintana i. valverde-asenjo a.l. lafuente c. gonzález-huecas

the role played by soil constituents in governing temporal trends of metal mobility in calcareousmediterranean soils deserves special attention due to the particular soil and climate characteristics. reactionsoccurring during the aging modify the metal mobility over time, and the rate of metal application and type ofsoil can be decisive in the outcome of aging reactions in soils. the aim of the...

This analysis was conducted on 31 synoptic stations in Iran. Initially, the Mann-Kendall test was administered in order to analyse the trend of alterations of these two components over time and the results suggest that 16% of the stations show significant relationship with annual precipitation (positive and negative). More stations showed significant relationships between sunspots and minimum a...

Journal: :environmental resources research 2013
gholamreza roshan

this analysis was conducted on 31 synoptic stations in iran. initially, the mann-kendall test was administered in order to analyse the trend of alterations of these two components over time and the results suggest that 16% of the stations show significant relationship with annual precipitation (positive and negative). more stations showed significant relationships between sunspots and minimum a...

This study is aimed at estimating suspended sediment load in watersheds using hydro-climatic factors with the intent to determine spatial and temporal variations of sediment yield in Qarah Su drainage basin, Ardebil Province. For this study, data from seven rain gauge and hydrometric stations during a 22-year period were used. The research was based on statistical regression analysis between va...

Journal: :آب و خاک 0
علی اکبر سبزی پرور مجتبی شادمانی

abstract in this research, temporal trends of reference evapotranspiration (et0) values were investigated in arid regions of iran. for this purpose, the meteorological observations collected from 11 high quality meteorological sites for a 41-year period (1965-2005) were used and statistically significant et0 trends in the monthly, seasonal and annual time basis were detected by the non-parametr...

Journal: :AStA Advances in Statistical Analysis 2017

Mahmoud Reza Pishvaie, Shadi Yadegar

In this article the methodology proposed by Li and Wang for mixed qualitative and quantitative modeling and simulation of temporal behavior of processing unit is reexamined and extended to more complex case. The main issue of their approach considers the multivariate statistics of principal component analysis (PCA), along with clustered fuzzy digraphs and reasoning. The PCA and fuz...

Journal: :تحقیقات آب و خاک ایران 0
حمیده نوری پردیس کشاورزی و منابع طبیعی دانشگاه تهران مونا دیهول کارشناس ارشد آبیاری و زهکشی پردیس کشاورزی و منابع طبیعی دانشگاه تهران مجید وظیفه دوست استادیار گروه مهندسی آب دانشگاه گیلان علی اکبر نوروزی دانش آموخته دکتری گروه خاکشناسی، دانشکده کشاورزی، دانشگاه تربیت مدرس

salinity is a phenomenon that does not satisfy the crop water requirement and leads reduction vegetation. to control of this phenomenon requires appropriate management and monitoring of spatial and temporal salinity variations from the past to the present in this study the spatial and temporal changes of soil salinity of irrigation and drainage network located in garmsar, iran, is investigated ...

2016
Earl W Duncan Nicole M White Kerrie Mengersen

OBJECTIVES To compare two Bayesian models capable of identifying unusual and unstable temporal patterns in spatiotemporal data. SETTING Annual counts of mammography screening users from each statistical local area (SLA) in Brisbane, Australia, recorded between 1997 and 2008 inclusive. PRIMARY OUTCOME MEASURES Mammography screening counts. RESULTS The temporal trends of 91 SLAs (58%) were ...

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