research centers


Search results: Found 176

Listing 1 - 10 of 176 << page
of 18
>>
Sort by

Article
Investigating the Effect of Denies Model in Developing Mathematical Skills for Fifth Primary Grade Pupils
أثر أنموذج دينز في تنمية المهارات الرياضية لدى تلميذات الصف الخامس الابتدائي

Authors: د. فتحي طه مشعل الجبوري --- بشائر صديق بكر النعمة
Journal: College Of Basic Education Researches Journal مجلة ابحاث كلية التربية الاساسية ISSN: 19927452 Year: 2018 Volume: 15 Issue: 1 Pages: 97-142
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Abstract: The research model was selected intentionally from research community, and consists of (46) pupils in the fifth class grade from school of Abby alfaqar for girls and distributed randomly on the two groups as much as (25) pupils for the experimental group which studied the subject according to Denies samples the and (21) pupils for the control group which studied subject itself on the according to the normal method, Next, the researcher started by applying the experiment from one of researcher on Sunday (23/1/2014) and ended on Thursday (17/4/2014 )and applying Mathematics skill pre-test, the data were analyzed statistically by using(T) tests for two independent samples and the results were as follows.There is difference with statistical significance between the two pre and post- tests of the experimental group of Mathematical skills tests in favor of post- tests.There is no significance difference between the two pre and post- tests of the construct group of Mathematical skills test. There is a difference with statistical significance between the average degrees of mathematical development skills for two groups, the experimental and control and in favor of the experimental groups.

هدف البحث الحالي إلى التعرف على أثر أنموذج دينز في تنمية المهارات الرياضية لدى تلميذات الصف الخامس الابتدائي .أُختيرت عينة البحث قصدياً من مجتمع البحث ، وتكونت من (46) تلميذة في الصف الخامس الابتدائي من مدرسة أبي الفقار للبنات وزعت عشوائياً الى مجموعتين بواقع (25) تلميذة للمجموعة التجريبية التي درست المادة على وفق أنموذج دينز و(21) تلميذة للمجموعة الضابطة التي درست المادة نفسها على وفق الطريقة الاعتيادية.بعد ذلك بدأ الباحثون بتطبيق التجربة احد الباحثين يوم الأحد الموافق (23/2/2014 ) وانتهت يوم الخميس (17/4/2014 ) ثم طبقت اختبار المهارات الرياضيه بعدياً, وحللت البيانات إحصائياً باستخدام الاختبار التائي لعينتين مستقلتين وظهرت النتائج الآتية:1.وجودفرق ذو دلالة إحصائية بين الاختبارين القبلي والبعدي للمجموعة التجريبية لاختبار المهارات الرياضية ولمصلحة الاختبار البعدي.2.عدم وجود فرق ذو دلالة إحصائية بين الاختبارين القبلي والبعدي للمجموعة الضابطة لاختبار المهارات الرياضية.3.وجود فرق ذو دلالة إحصائية بين متوسط تنمية المهارات الرياضية للمجموعتين التجريبية والضابطة ولمصلحة المجموعة التجريبية.


Article
Using Paper Waste as Adsorbent for Methyl Violet dye removal from waste water
أستعمال المخلفات الورقية كمازة لأزالة صبغة المثيل البنفسجية من مياه الصرف الصحي

Authors: Dr. Besma Mohammed Fahad --- Nisreen Sabah Ali --- Tamarah Tareq Hameed3
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 1 Pages: 1-11
Publisher: Al-Mustansyriah University الجامعة المستنصرية

Loading...
Loading...
Abstract

This study has been conducted to examine the possibility of using waste paper as an adsorbent to remove methyl violet (MV) 2B dye from waste water. Initial dye concentration in the rang (20 to 80mg/L), pH of solution in the rang (4-10), adsorbent dose range (0.5-2.5 g) and contact time varying from (30 to 180)min, were studied. The experimental adsorption isotherms were fitted with the Langmuir and Freundlich models were found to be more represented to the experiments with high correlation coefficient (R2 = 0.8144). The results showed that the highest (MV ) dye removal efficiency was (97.63) at optimization condition pH 8, at room temperature for 120min, 2 g adsorbent dose and 20 mg/L dye concentration. The value of adsorption capacity was found to be 4.3 mg /g.


Article
3D Geological Model For Khasib, Tanuma, and Sa'di formations of Halfaya Oil Field in Missan Governorate-Southern Iraq

Authors: Arjwan Hamid Fayadh --- Mad'hat E. Nasser
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2018 Volume: 59 Issue: 2B Pages: 875-885
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

A geological model is a spatial representation of the distribution of sediments and rocks in the subsurface. Where this study on Halfaya oil field; it is located in Missan governorate, 35 km southeast of the city of Amara. It is one of the main fields in Iraq because it is production high oil. This model contains the structure, and petrophysical properties (porosity, water saturation) in three directions. To build 3D geological models of petroleum reservoirs. Khasib, Tanuma, and Sa’di formations in Halfaya oil field have been divided into many layers depending on petrophysical properties and facies


Article
A Computer Program for Estimating the Sediment Load Entering the Right Side of Mosul Dam Reservoir

Authors: Mohammed Qusay Mahmood --- Muayad Saadallah Khaleel
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2018 Volume: 25 Issue: 1 Pages: 60-68
Publisher: Tikrit University جامعة تكريت

Loading...
Loading...
Abstract

Mosul Dam is one of the important dams in Iraq, it suffers like other dams from the problem of sediment accumulation in the reservoir. The daily surface runoff was estimated from three main valleys (Sweedy, Crnold, Alsalam) in the right bank of the reservoir during the period 1/1/1988 - 31/8/2016 by applying SWAT model. The model performance was assessed and the results were good. The daily sediment load was estimated by three methods, Bagnold method was adopted in SWAT, while Toffaletti and Einstein methods were programed by MATLAB. The averages annual sediment load from the main valleys to the reservoir were 1.08×103 - 27.32×103, 0.08×104 - 10.41×104 and 0.44×105 - 28.66×105 tons for Bagnold, Toffaletti and Einstein methods respectively. The valley Sweedy is the main supplier of sediments to the right side of the reservoir with 89%.


Article
Elastic electron scattering from 6He and 11Li halo nuclei

Author: Ahmed N. Abdullah
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2018 Volume: 59 Issue: 2C Pages: 1057-1064
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

The binary cluster model (BCM) and the two-frequency shell model (TFSM) have been used to study the ground state matter densities of neutron-rich 6He and 11Li halo nuclei. Calculations show that both models provide a good description on the matter density distribution of above nuclei. The root-mean square (rms) proton, neutron and matter radii of these halo nuclei obtained by TFSM have been successfully obtained. The elastic charge form factors for these halo nuclei are studied through combining the charge density distribution obtained by TFSM with the plane wave Born approximation (PWBA).


Article
Effect of DEM and Land Cover Resolutions on Simulated Runoff of Adhaim Watershed by SWAT Model

Authors: Mahmoud S. Al-Khafaji --- Fouad H. Saeed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 4 Part (A) Engineering Pages: 439-448
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

Accurate estimation of surface runoff by using Soil and Water Assessment Tool (SWAT) model is highly depends on the accuracy of the Digital Elevation Model (DEM), Land Cove and Land Use (LC/LU), soil and weather data as input variables. The interactive and complementary effects of the DEM and LC/LU resolutions on the estimated runoff were not taken into consideration in previous studies. This research aims to study these effects on the accuracy of runoff estimation of Adhaim Watershed by using SWAT Model. Twenty surface runoff estimation SWAT models of Adhaim Watershed were implemented using five DEMs with spatial resolution of 30, 50, 90, 250 and 1000m in conjunction with four LC/LUs with spatial resolution of 30, 300, 500 and 1000 m. These models were calibrated and verified on daily time step with the adoption of maximizing Nash and Sutcliffe Efficiency (NS) as an objective function. The results of SWAT models show that specifying the watershed boundary and the total area is highly affected by the DEM resolution without considerable trend. Also, the estimated minimum altitude is inversely related to the DEM resolution, whereas the maximum altitude has a direct relationship. Furthermore, LC/LU resolution is highly affected the number and area of classes that can be distinguished in the LC/LU image. Although, the number of hydrologic response units (HRUs) depends on LC/LU resolution, it was found that this number increases with the increase in LC/LU resolution to a maximum number of HRUs and then it gradually decreases. Whereas, the HRUs has a direct relationship with the DEM resolution and the number of subbasins irregularly changed with the increase of DEM resolution. Results of runoff estimation by using SWAT models show that the estimated runoff is not directly or inversely related to the DEM and LC/LU resolutions. Moreover, the most accurate runoff was not estimated with the highest DEM and LC/LU resolutions, where it is obtained with DEM and LC/LU resolutions of 250 m and 1000 m respectively with NS of 0.74. Accordingly, it is recommended to use these resolutions for estimating the surface runoff of Adhaim Watershed. The relationship between the HRUs and estimated runoff is very complex therefore; more extensive studies are required to comprehend this relationship.


Article
Assessment of Monthly Surface Air Temperature in Iraq Using General Circulation Model.

Authors: Ahmed S. Hassan --- Jasim Hameed Kadhum --- Ali H. Hashem
Journal: Journal of Education for Pure Science مجلة التربية للعلوم الصرفة ISSN: 20736592 Year: 2018 Volume: 8 Issue: 2 Pages: 193-207
Publisher: Thi-Qar University جامعة ذي قار

Loading...
Loading...
Abstract

Global Climate Models (GCM) has been developed to perform climate projection to simulate andunderstand climate change in response to emission of greenhouse. The aim of this study is to usesimple numerical climate models to investigate effect of various parameters, functions, andcomponents of climate system on the temperature rise. Two climate changes scenarios used toestimate and explore the future rise surface air temperature over Iraq until 2050. The result of thesurface air temperature of scenario A for July has been 31.6 C in the first decade (1961 - 1970),while the last decade of study has been more than 37 ºC, while scenario C less than scenario A 3.8 ºCfor most cases. January's surface air temperature for last decade has been 10.0 ºC, while observationdata is more than model by two times. Anomaly surface air temperature focused on the behavior ofvariable more than value of it, so that this study carried out the fluctuations of two scenarios havebeen close together for first five decades, while the difference appears in the last three decades forexample for Baghdad city in winter the difference between two scenarios began form 2030 about 2ºC. Summer surface air temperature for Baghdad city has been higher value than surrounding regionsfor both scenarios A and C to reach 2-3 ºC.

تعد نماذج المناخ العلميالتي تطرأ على الغازات المسببة للانبعاث الحراري. ان الھدف من ھذه الدراسة ھو استخدام نماذج مناخ بسیطة من تشخیص تاثیرالذي یحدثھ من تباین على العوامل والدوال التي یتكون منھا النظام المناخي والتحدید على ارتفاع درجة الحرارة. استخدم نوعین منسیناریوھات التغیرات المناخیة لتقییم الزیادة المتوقعة في درجة للعراق لغایة ۲۰٥۰ . كانت نتائج درجة حرارة سطح الھواء للنموذجالذي ھو C 37 ، اما بالنسبة للنموذج °C ۱۹۷۰ ) بینما كانت في العقد الاخیر - 31.6 للعقد الاول ( ۱۹٦۱ °C لشھر تموز ھو A10 للعقد الاخیر من الدراسة ، بینما °C 3.8 لمعظم الحالات . وكانت درجة حرارة كانون الثاني °C بمقدار A اقل من النموذجتكون درجة الحرارة الحقیقیة اكثر من النموذج بضعفین. ان شذوذ درجة الحرارة یركز على سلوك المتغیرات اكثر من القیمة العددیة، لذلك ھذه الددراسة انتجت ان التذبذبات لدرجة الحرارة متقاربة لكلا السیناریوھیین في العقود الخمسة الاولى، ولكن تظھر ھذهالاختلافات في العقود الثلاثة الاخیرة وعلى سبیل المثال ظھر اختلاف درجة الحرارة لمدینة بغداد شتاءا بعد عام ۲۰۳۰ بمقارلیصل (A, C) درجتین مئوییتین. كانت درجة الحرارة لفصل الصیف لمدینة بغداد اعلى من المناطق المجاورة ولكلا السیناریوھات.( 2-3 °C ) من


Article
Experimental Study of the Influence of Dust Particle on Link Range of Free Space Laser Communication System

Author: Jenan A. Khalati
Journal: journal of the college of basic education مجلة كلية التربية الاساسية ISSN: 18157467(print) 27068536(online) Year: 2018 Volume: 24 Issue: 102 / علمي Pages: 27-32
Publisher: Al-Mustansyriah University الجامعة المستنصرية

Loading...
Loading...
Abstract

The spectrum attenuation of free space optical (FSO) communication systems operating at visible and near infrared (NIR) wavelengths (650nm , 850nm and 1550) under dust was experimentally investigated. Dust are generated and controlled homogeneously along a dedicated atmospheric chamber of (93*63*60)cm dimensions.Attenuation due to aerosols restricts the distance of FSO communication systems and limits the availability for line-of-sight terrestrial link. This work is focused on the effect of aerosols on the FSO link. The attenuations was studied in the aerosols phenomena for three selected wavelengths (650, 850, and 1550 nm( for transmitting range (1-12) Km.


Article
STUDY THE EFFAECT OF TWEEN 80 ON CLTHRATE HYDRATE FORMATION BEHAVIOR FOR R-134A

Authors: Shurooq T. AL-Hemeri --- Riyadh S. AL-Mukhtar --- Mustafa S. Mohammed
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2018 Volume: 11 Issue: 3 Pages: 372-395
Publisher: Al-Qadisiyah University جامعة القادسية

Loading...
Loading...
Abstract

Clathrate hydrates are complex molecules formed by the contact between water and gas at high pressure and low temperatures. One of the important aims of gas hydrate technology is to enhance the formation of hydrate and reduction the induction time for clathrate formation. Effect of the different promoters (nonionic surfactant Tween80) on R-134a gas hydrate formation has been investigated in the isochoric system experiment. It is noted that the surfactants have a significant effect of increasing the speed of nucleation as well as improving the growth of hydrate. In the experiment, the effect of Tween80 surfactant was studied to determine its effect on the composition and cooling capacity of 134 hydrates. From kinetic models, many objective functions such as the amount of gas consumed (Δn), the growth rate (r (t)), the apparent rate constant (Kapp) and conversion of the water to hydrate were obtined. The improvement of hydrate growth is marked by the addition of surfactants, which in turn increase the solubility of hydrate gas and reduce the contact angle. In addition, surfactants positively the contact with the gas through the increase of the gas diffusion in the water and this increases the rate of formation of hydrate. Best value achieved at a surfactant concentration of 100 ppm with maximum gas consumed amount (0.16 mol) and less indction time 32 min.


Article
Using SCS-CN Model in Estimating the Amount of Torrent Risk in Dal Koz Valley Ba y
استخدام نموذج SCS-CN في تقدير حجم مخاطر السيول في حوض وادي دال كوز

Authors: Isaac Salih Alakaam اسحق صالح العكام --- Khaldoun Rahman Alwan خلدون رحمان علوان
Journal: Journal of Research Diyala humanity مجلة ديالى للبحوث الانسانية ISSN: 1998104x Year: 2018 Issue: 76 Pages: 352-375
Publisher: Diyala University جامعة ديالى

Loading...
Loading...
Abstract

This research included estimating the volume of superficial flow for the basin of Valley Dal Koz. It is one of the seasonal valleys which depends on the fall of rain were the average of its water increases in winter. Valley Dal Koz lies in Kalar District in its South-East part of Kurdistan region in Iraq within the Administrative boarders of Sulimanya Governorate in North-East part of Iraq. It slops from mountain (Dara Khala) North-East of Kalar District, the total area of the basin is (157 km2) with length (31.9 km2). The quality of surface water has been studied to show its appropriateness for different usages by comparing it with international and Iraqi specifications. Also, the study of the risk of flowing in the basin depending on different standards for classifying the risks of basins represented by some morphometric aspects and some hydrological aspects it seems by using the classification of showing the grades of flowing risks that Sofee Ahmed had a high level of risk.

تضمن البحث دراسة حجم الجريان السطحي لحوض وادي دال كوز ,وهو من الأودية الموسمية التي تعتمد على سقوط الامطار إذ تزداد مياهها في فصل الشتاء ,يقع وادي دال كوز في قضاء كلار في الجزء الجنوبي الشرقي من اقليم كوردستان العراق ضمن الحدود الادارية لمحافظة السليمانية وفي الجزء الشمالي الشرقي من العراق ,تبلغ مساحة الحوض (157كم2) وبطول (31.9كم) ,وتهدف الدراسة الى تقدير حجم مخاطر السيول في الحوض بالاعتماد على فرضية خدمات حفظ التربة الامريكية American Soil – Conservation service (SCS) التي تعتمد على نوعية التربة ودرجة نفاذيتها وتم تصنيف الغطاء الارضي للحوض, ومن ثم تقدير عمق وحجم الجريان المتوقع عقب سقوط الامطار لموجات مطرية مؤثرة خلال عشر سنوات من 2005 ـ 2014 , وتم دراسة مخاطر السيول في الحوض بالاعتماد على عدة معايير لتصنيف خطورة الاحواض وتمثلت في بعض الخصائص المورفومترية وبعض الخصائص الهيدرولوجية وآتضح من تصنيف درجات خطورة السيول للأحواض الثانوية ان حوض صوفي احمد ذات مستوى عالٍ من الخطورة .

Listing 1 - 10 of 176 << page
of 18
>>
Sort by
Narrow your search

Resource type

article (176)


Language

English (85)

Arabic (55)

Arabic and English (33)


Year
From To Submit

2018 (176)