11 hasil untuk "R. Modarres"
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Multi-criteria validation of artificial neural network rainfall-runoff modeling
In this study we propose a comprehensive multi-criteria validation test for rainfall-runoff modeling by artificial neural networks. This study applies 17 global statistics and 3 additional non-parametric tests to evaluate the ANNs. The weakness of global statistics for validation of ANN is…
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Dust Storm Frequency in Connection with Climatic Change in the Arid Region of Iran
Dust storms in arid and semi-arid regions have harmful impacts on the environment, the economy, and the health of local and global communities. In this study, the frequency of annual dust events in twenty-five stations and five climatic variables including rainfall, maximum annual wind speed…
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Evaluation of New Drought Index of SPDI (Standardized Palmer Drought Index) in Chaharmahal-Va-Bakhtiari Province
Several indices are used for drought identification and quantification. In this paper, the new Standardized Palmer Drought index (SPDI) was introduced and then the drought condition of Chaharmahal-Va-Bakhtiari Province was studied using this index. For this study, 11 synoptic, climatology, and…
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Classification of Rangeland Bioclimatic Areas of Iran Based on Spectral Analysis
This study was conducted to present rangeland bioclimatic zoning for Iran based on the changes in the power spectrum of the average monthly Net Primary Production (NPP) of the rangelands of Iran. Fluctuations of the mean monthly power spectrum of the NPP signal of rangelands of Iran from 2000 to…
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Evaluating the Feasibility of Direct Flood Damage Estimation Using the HEC-FIA Model in the Semirom Watershed
Floods are among the most frequent and destructive natural disasters worldwide, causing significant damage to human infrastructure and the environment each year. This study aims to assess the direct damages caused by flooding using the HEC-FIA model in the Semirom watershed. In the first step…
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Using the Principal Component Analysis Approach for Weighting Statistical, Climatic and Geographical Attributes of the Maximum 24-hour Rainfall and Spatial Clustering Analysis (A Case Study: Urmia Lake Basin)
Regionalization is one of the useful tools for carrying out effective analyses in regions lacking data or with having only incomplete data. One of the regionalization methods widely used in the hydrological studies is the clustering approach. Moreover, another effective factor on clustering is the…
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Hydrologic Drought Frequency Analysis in Karkhe Basin Based on Bivariate Statistical Analysis
In recent years, the joint distribution properties of drought including severity and duration have been widely evaluated using copula. Few studies, however, have worked on drought modeling based on stream flow, especially in semi-arid regions such as the southern regions of Iran. This study…
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Assessment of Multivariate Standardized Drought Index (MSDI) and Meteoro-Agricultural Drought Monitoring in Chaharmahal and Bakhtiari Porvince
Drought, as one of the most complicated natural events, causes many direct and indirect damages each year. Hence, single variable identification and monitoring of drought may not be appropriate enough for decision-making and management. In this study, in order to monitor the…
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Hydrological Drought Monitoring Based on the Correct Calculation of Standardized Flow Index in the Karkheh Basin
Drought is one of the most destructive and important climate phenomena, whose effect is usually more important on a regional scale. The importance of this phenomenon is more evident in the Karkheh basin due to its size and important role in providing the country's water resources. We aim to monitor…
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Risk Factors for Post Endoscopic Retrograde Cholangiopancreatography Pancreatitis and Hyperamylasemia
BACKGROUND AND OBJECTIVE: Acute post ERCP pancreatitis (PEP) is still the most common complication of endoscopic retrograde cholangiopancreatography (ERCP), and the reported incidence ranges between 5% and 20%. This difference reflects variety of patient populations, indications, definition of…
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Determination of the Frequency of Different Blood Types in Patients with Stomach Cancer Referring to Shahid Beheshti Hospital during 2006-2011
BACKGROUND AND OBJECTIVE: Stomach cancer tends to progress gradually over the years. Considering the relationship between blood type, peptic ulcers and impaired mucus secretion, we aimed to determine the frequency of ABO and Rh blood types in patients with stomach cancer. METHODS: This…