Table of content

AL Rafdain Engineering Journal

مجلة هندسة الرافدين

ISSN: 18130526
Publisher: Mosul University
Faculty: Engineering
Language: Arabic and English

This journal is Open Access

About

Al Rafidain Engineering Journal
Abstract

The first issue of Al Rafidain Engineering Journal published in 1993 by the college of engineering – University of Mosul. The journal is publishing at a rate of six issues in the year (Bi-Monthly).
The journal publishes the referred original and valuable engineering research papers.
Al Rafidain engineering journal includes the following titles:

• Architectural Engineering
• Civil Engineering
• Computer Engineering
• Electrical Engineering
• Environmental Engineering
• Mechanical Engineering
• Megatronic Engineering
• Water Resources Engineering
The aim of publishing the journal is to develop the knowledge in the fields of applied engineering science.

• irrigation and drainage engineering
• Computer Engineering
Target domain and
Rivers Engineering magazine aims to develop knowledge in the field of engineering and science related to it. Should contribute to the article submitted for publication in the development of engineering sciences in various fields will be considered in the dissemination of innovative and distinctive articles in these areas. Articles which are referred to the magazine for the purpose of evaluating the arbitrators with the reputation and extensive experience in the field of jurisdiction has been accepted for publication or apologize. And will be re-papers not accepted for publication to their owners.

Loading...
Contact info

ealrafidain@yahoo.com

Table of content: 2007 volume:15 issue:4

Article
Laboratory Study Of Scour Downstream Gabions Protecting Rockfill Weirs
دراسة مختبرية للنحر مؤخر الهدارات الركامية المحمية بالسلال الحصوية

Loading...
Loading...
Abstract

Abstract In this research a laboratory study was carried out to investigate the scour phenomenon downstream gabions protecting rockfill weirs. The study includes the measurement of maximum scour depth and length of scour hole downstream the weir. The shape of scour hole was also studied. Three sizes of aggregate of diameters (0.7937, 1.111, 1.5875)cm were used as downstream bed protection. Three different downstream slopes (1V : 10H , 1V : 7.5H , 1V : 5H) were tested for all sizes of aggregate. Laboratory results of this study showed a direct relation between scour depth and scour hole length with the densimetric particle Froude number; also, a direct relation with downstream slope. Two empirical equations were obtained; one for the estimation of relative scour depth and the second for the estimation of relative length of scour hole. Key word: Scour, aggregate beds, rockfill weirs.


Article
Prediction Of Behaviour Of Reinforced Concrete Deep Beams With Web Openings Using Finite Elements
التنبؤ بسلوك العتبات الخرسانية المسلحة العميقة ذات الفتحات باستخدام العناصر المحددة

Authors: Khalaf Ibrahem Mohammad
Pages: 1-12
Loading...
Loading...
Abstract

Abstract This study presents a nonlinear analysis using the finite element method to predict the ultimate load and mode of failure for reinforced concrete deep beams with web openings. Materials nonlinearities due to cracking, plastic flow or crushing of concrete and yield conditions of the reinforcing steel are considered. The capabilities of the proposed model have been examined and demonstrated by analyzing five reinforced concrete deep beams with web openings. Keywords: nonlinear, elasto-perfect plastic, finite element, reinforced concrete, deep beams, web openings


Article
Role Of Clays Addition On The Stability Of Collapsible Soil Selected From Mosul City
دور اضافة الاطيان على استقرارية تربة متداعية مختارة من مدينة الموصل

Loading...
Loading...
Abstract

Abstract Volume changes of a collapsible soil selected from Hawy Al-Kanissa in Mosul city were studied. The Influence of addition of (5, 15 and 30) % of low (CL) and highly plastic (CH) clayey soil were studied. Many variables as: the initial dry unit weight, water content and applied stresses on volume change were considered. State diagrams representing gradual volume change due to these variables were also presented and discussed. The main results were showed that the collapse potential (Cp) increased continuously for samples mixed with (CL) soil while there were a maximum value at (5%) of (CH) soil. At low unit weight, (Cp) for samples mixed with (CL) reached a highest value at certain stress, then started to decrease, while it increased continuously using (CH). (Cp) of soils containing (CH) was found to be less than that mixed with (CL) soil. Concerning soil volumetric changes using state diagrams presentation, volume change for undisturbed natural soil at low moisture content was found less than that in disturbed samples, but the inverse was obtained at saturation. Besides that, volume changes increased with the increase of the clay additive in different manner for (CL) and (CH) soils. Keywords: Clay, Collapsible soil, Volume change, unsaturated soil.


Article
Estimating Daily Reference Evapotranspiration for Mosul Area Using Artificial Neural Networks
تقدير التبخر– النتح المرجعي اليومي لمنطقة الموصل باستخدام الشبكات العصبية الاصطناعية

Loading...
Loading...
Abstract

Abstract In the present study a mathematical model using Artificial Neural Network (ANN) was developed to estimate the daily reference evapotranspiration for Mosul area (northern part of Iraq) using daily meteorological data measured over 21 years, which are believed to influence the evapotranspiration process. The data are consisting of temperature, sun radiation, wind speed, and relative humidity. These variables have been used as inputs to the ANN, while the daily evaporation was adopted as an output. The study reveals that there is a high linear correlation between the evaporation estimated by the proposed ANN and that measured using class A evaporation pan with a correlation coefficient of 0.95. This clearly indicates the possibility of using AAN technique for estimating the evapotranspiration component, which can be calculated by multiplying the output of ANN (i.e. evaporation) by the pan coefficient. Additionally, sensitivity analyses have been conducted to study the effects of the specific variables of inputs on the proposed network's performance. It is found that ANN’s performance is highly affected when the temperature, sun radiation, and wind speed are concurrently acted, while the effect of the relative humidity was limited especially when it is accompanied by the temperature.


Article
Fitting of Matrics Potential at Wetting Front as Function of Some Water Properties
توافق قيم الشد عند جبهة الابتلال كدالة لبعض الصفات المائية للتربة

Loading...
Loading...
Abstract

الخلاصة نفذت الدراسة الحقلية في ثلاث مواقع ضمن محافظة نينوى لترب مختلفة النسجة والاستخدام بتطبيق بعض المعادلات للتنبؤ بالشد عند جبهة الابتلال من خلال تغير المحتوى الرطوبي اثناء غيض الماء في التربة باستخدام إسطوانة الغيض المزدوجة للترب المزروعة وغير المزروعة لمعرفة مدى توافق قيم الشد عند جبهة الابتلال كدالة لبعض الصفات المائية للتربة .اوضحت النتائج ان المستويات الواطئة من الرطوبة اكدت عدم ارتباط الايصالية المائية كدالة للمحتوى الرطوبي بل اعتمد على تغير الجهد الهيدروليكي . من جهة اخرى اظهرت النتائج توافق قيم الشد عند جبهة الابتلال كدالة للمحتوى الرطوبي مع جهد الشد عند جبهة الابتلال كدالة للامتصاصية المحسوبة عند المحتوى الرطوبي الاقل من السعة الحقلية.


Article
Simulation of Handoff Techniques in Mobile Cellular Networks
محاكاة تقنيات المناقلة في الشبكات الخلوية

Authors: Dr. S. A. Mawjoud
Pages: 31-39
Loading...
Loading...
Abstract

Abstract Mobility is the distinct feature of wireless mobile cellular system. Usually, continuous services is achieved by supporting handoff which is the transfer of an ongoing call from the current cell to the next adjacent cell as the mobile moves through the coverage area. usually handoff calls are given higher priority than new calls since it has a significant impact on the network performance. Simulation study of the relative signal strength with hysteresis and threshold (RSS-HT) algorithm for varying hysteresis and threshold are studies to evaluate the mean number of cell handoffs, mean number of wrong cell handoffs and expected average signal strength. Keywords- Cellular network, signal strength, handoff schemes.


Article
Digital Image Compression Enhancement Using Bipolar Backpropagation Neural Networks
تحسين ضغط الصور الرقمية باستخدام شبكات الانتشار العكسي العصبية ثنائية القطبية

Authors: Rafid Ahmed Khalil, Ph.D.,
Pages: 40-52
Loading...
Loading...
Abstract

Abstract It is well known that the classic image compression techniques such as JPEG and MPEG have serious limitations at high compression rate, the decompressed image gets really fuzzy or indistinguishable. To overcome this problem, artificial neural networks ANNs techniques are used. In this paper, we propose a bipolar sigmoidal backpropagation BBP algorithm to train a feedforward autoassociative neural network. The proposed method includes steps to break down large images into smaller windows for image compression/ decompression processes. A number of experiments have been achieved, the results obtained, such as compression ratio and peak signal to noise ratio PSNR are compared with the performance of linear backpropagation LBP and standard (sigmoidal) backpropagation SBP schemes

Keywords


Article
Patterns Of Residential Clusters In Single-Family Housing In The Iraqi City
أنماط التجميعات السكنية في السكن المنفرد الأسرة في المدينة العراقية

Loading...
Loading...
Abstract

Abstract This research tries to review the way how to form and create (the Pattern of Residential Cluster) in single – family housing in the Iraqi City. The present study defines the research problem basically as a reconsideration or reformulation of scientific and applied approaches to understand the nature of (Residential Cluster)as a big cell comparing with the small one(The Dwelling Unit), within the urban residential fabric. The research tries to approve a methodology in forming or producing patterns of these clusters through comprehensive and complementary concept regarding all components of residential physical fabric,. The research takes into consideration the concept of balance between (the part and the whole) by studying the interrelationship between the (residential cluster) and other components, and also takes the network of urban spaces within the residential fabric into consideration, in order not to neglect the value of urban space. The results in this research indicates many patterns of residential clusters with specific identify and characteristics for each. These patterns have been produced according to the mentioned methodology, that can approve wide range of created patterns in accordance with current Housing Standards in Iraqi City. Key Wards: single family housing , residential cluster


Article
Effect Of Wet And Dry Cutting Conditions On Dimensional Accuracy In Turning Operation
تأثير ظروف القطع الرطب و الجاف على دقة البعد في عملية الخراطة

Authors: Dler Abdullah Ahmed
Pages: 53-60
Loading...
Loading...
Abstract

Abstract This work is done by turning a medium carbon steel bare which contains 0.35%C using high speed steel cutting tool. Dimensional deviation is taken as a criterion to compare between parts produced by dry and wet cutting condition. It is observed that, in traditional wet cutting condition by water-oil solution, an irregular conical shape is produced and the diameter of the work piece is increased from initial to the end of the work piece. But in the dry cutting condition the diameter is near to the desired diameter because the decrease in the tool length due to a flank wear is substituted due to the thermal expansion of the cutting tool. Fortunately, it is observed that the dry cutting condition is more accurate in diameter than the wet cutting condition. Keywords: Dimensional deviation, Flank wear, Dry and Wet cutting condition.

Keywords


Article
Positioning and Stabilizing Of an Inertial System Subjected To Oscillatory Disturbance Using Electro- Hydraulic Control
التثبيت الطوعي والاستقرارية لنظام كتلي معرض الى اضطرابات اهتزازية باستخدام سيطرة كهروهيدروليكية

Loading...
Loading...
Abstract

Abstract In this work, a control system for positioning and stabilizing a massive inertial system subjected to continuous disturbances, which represents the oscillatory motion of the base, is investigated. A hydraulic system is proposed and simulation is used to select and test the effect of different parameters of the hydraulic parts, particularly those of the electro – hydraulic servo valve, at different values of the supply pressure of the hydraulic fluid. The inertial system dynamics and the hydraulic parts are mathematically modeled and simulated by digital computer using (MatLab). The dynamic characteristics of the control system, such as the stability and the time response in addition to the ability of the system to reduce the effect of the external disturbances are examined. The results show that the control system is capable of reducing these effects between (70% to 90%) depending on the supply pressure of the hydraulic system and the frequency of the external disturbances. In addition, the effect of using pressure limit valve in the hydraulic system and that of the presence of dry friction of a relatively high value, are investigated. Keywords: position control, hydraulic system, stabilization of inertial system, Electro-Hydraulic Control

Keywords


Article
Factors Affecting the Occupation Devaition of Dwelling Units Spaces in New Districts in Mosul
العوامل المؤثرة في انحراف نمط الأشغال لفضاءات الوحدة السكنية في الاحياء الحديثة لمدينة الموصل

Loading...
Loading...
Abstract

Abstract The Actual occupation of Spaces in dwelling units is assummed to be coincidence with the desingated pattern of these spaces . This research aims to determine first the swerving of the actual occupation from the designated pettern , and second the factors affecting this swerving both related to dwellings attributes or occupants characteristics . A sample of (100) dwelling units is randomly selected in Mosul For the studyو the statistical analyses of variables lead to findings which explain the effect of both dwellings and occupants attributes on the occupation pattern . Key Words :Housing , Spaces Occupation , Post Occupancy Evaluation


Article
A Qualitative Study of a Rotating Shaft Having a Slant Crack
دراسة نوعية لدوران عمود متضمناً شقا مائلا

Loading...
Loading...
Abstract

Abstract In this study, a qualitative analysis of a transverse vibration of a rotor system with a crack that grows at an angle of 45 degrees toward the axis of the shaft is presented. Based on the assumption that the bending stiffness of the shaft changes synchronously with the opening / closing behavior of the crack caused by the torsional vibration of the shaft, the equation of motion of a simple rotor system with a shaft having a slant crack is represented by a differential equation with parametric excitation in fixed coordinate system rotating at the operation speed of the rotor. Finally, it is shown by the solution that the steady-state response of the rotor system with a slant crack on its shaft induced by imbalance contains the frequencies represented by

Keywords


Article
Concepts Architecture For Architectural Students
المفاهيم في العمارة (الكونسبت) لطلبة قسم العمارة

Loading...
Loading...
Abstract

Abstract Formation of concept in Architecture Design is something unusual to many student and most projects been designed with no knowledge of how to use concepts properly. This research introduce meaning and form of concepts in Architecture. Range and scope in Academic and professional work. Also problems, which face student such as Communication, Adaptation, and the correct type, show types of concept. Research also shows types of concept and concepts hierarchies. Applied part of this research will deal with some student' projects. Who adapt concepts. And to analyze forms and types of their concepts through different tables. Inter views have been made with students of fourth year to discover how students had been arrived to final solution

Keywords


Article
Paradigms of Dealing with Context of Place in Iraqi Contemporary Architecture (1960-1980)
عمارة المكان صيغ التعامل مع السياق المكاني في العمارة العراقية المعاصرة (1960-1980)

Loading...
Loading...
Abstract

Abstract Architecture of place is a preposition presented in the modern architectural trends, especially in post-modernisim as a reaction against modern architecture and its planning ideology of architectural unity. New trends were emerged concentrating on architecture related to place. As in Iraq. The paper discusses the importance of this subject, in order to explore the particular problem which has been represented as (lack of clarity of architecture of place in Iraqi contemporary architecture 1960-1980). Thus the objectives of the paper has been formed and method has been specified by building theoretical framework consisting of two main items as the following: (Responses and considerations relating to architecture of place), firstly, then the application of the cultural considerations on selected architectural trends through Iraqi contemporary architecture (1960-1980), secondly, finally, concluding paradigms of dealing with context of place, thirdly. Coclusions have been declared the importance of the role of place in works of Iraqi architects during sixties and seventies concentrating on the strong relationship between the place with its natural and cultural considerations, on one hand, and the product (building) and the human being who inhabits it, on the other hand. Keywords: Architecture of place, Iraqi contemporary architects, Context of place.


Article
Teaching Architectural History _ Goals and Tools Study in Literatures of Architectural History Curriculums
تدريس مادة تاريخ العمارة _ الأهداف والوسائل قراءة في أدبيات مناهج تدريس تاريخ العمارة

Loading...
Loading...
Abstract

Abstract The research deals with architectural history as one of the basic subjects in architectural teaching and learning, exploring both its’ goals and tools. Its’ goals concentrated directly on developing mental skills of students, and indirectly on either the concept of historical continuity or the concept of historical development. Its’ tools can be defined by the procedures of knowledge communication which includes both procedures of teaching and studying history, and the scientific content to be communicated to students. Keywords: architectural history curriculums, procedures of teaching history, historical knowledge communication, historical knowledge content.

Table of content: volume: issue: