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Article
Evaluating Study of Tigris River Water Quality and Three Water Treatment Plants within Nineveh Governorate

Author: Mohammed Fakhar Al-Deen Ahmed
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2016 Volume: 23 Issue: 1 Pages: 105-114
Publisher: Tikrit University جامعة تكريت

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Abstract

Tigris River considers the main resource of water for Mosul city, therefore it is of great importance to evaluate its quality continuously. In this study, chemical and physical properties of Tigris River had been studied within Nineveh governorate during the year (2012) by using the average values for ten selected sites. Computing of Water Quality Index (WQI) was done by using Weight Average (WAV) method. In spite of the large amount of the wastewater disposed into the river, the results indicated that Water Quality (WQ) in all the studied sites was suitable for irrigation purposes. For drinking purposes, only the first northern four sites were in need to simple treatment, while the following remaining sites need conventional treatment. The efficiency of the three main Water Treatment Plants (WTPs) on Tigris River were computed according to a new (WQI) that include new additional parameters and different relative weights. These three plants are; Mosul new left side (WTP), Mosul right side monotheist (WTP), and Mosul old left side (WTP). The efficiency results were (70, 62, 55)% respectively. The Low efficiency of the old plant was due to the high effluent concentrations of turbidity, SO4, total hardness, and TDS.


Article
A Comparison Between Some Estimator Methods of Linear Regression Model With Auto-Correlated Errors With Application Data for the Wheat in Iraq
مقارنة بين بعض طرائق تقدير انموذج الانحدار الخطي بوجود الارتباط الذاتي للاخطاء مع التطبيق على بيانات الحنطة في العراق

Author: احمد ذياب احمد
Journal: journal of Economics And Administrative Sciences مجلة العلوم الاقتصادية والإدارية ISSN: 2227 703X / 2518 5764 Year: 2015 Volume: 21 Issue: 86 Pages: 675-686
Publisher: Baghdad University جامعة بغداد

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Abstract

This research a study model of linear regression problem of autocorrelation of random error is spread when a normal distribution as used in linear regression analysis for relationship between variables and through this relationship can predict the value of a variable with the values of other variables, and was comparing methods (method of least squares, method of the average un-weighted, Thiel method and Laplace method) using the mean square error (MSE) boxes and simulation and the study included fore sizes of samples (15, 30, 60, 100). The results showed that the least-squares method is best, applying the fore methods of buckwheat production data and the cultivated area of the provinces of Iraq for years (2010), (2011), (2012), (2013), (2014).

يدرس هذا البحث انموذج الانحدار الخطي بوجود مشكلة الارتباط الذاتي عندما الخطأ العشوائي يتوزع توزيعا طبيعيا اذ يستعمل الانحدار الخطي في دراسة وتحليل العلاقة بين المتغيرات ومن خلال هذه العلاقة يمكن التنبؤ بقيمة احد المتغيرات بوجود قيم المتغيرات الاخرى, وتمت المقارنة بين الطرائق (طريقة المربعات الصغرى, طريقة المعدل غير الموزون, طريقة ثايل وطريقة لابلاس) باستعمال متوسط مربعات الخطأ (MSE) وباسلوب المحاكاة وان الدراسة تضمنت اربعة احجام للعينات (15, 30, 60, 100), واظهرت النتائج ان طريقة المربعات الصغرى هي الافضل, وطبقت الطرائق الاربعة على بيانات انتاج الحنطة والمساحة المزروعة لمحافظات العراق للسنوات (2010), (2011) , (2012), (2013), (2014).

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