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: 2006 volume:14 issue:1

Article
Changing the Architectural Elements and it’s Effect on Mosul Architecture
تغير العناصر المعمارية واثره في عمارة الموصل

Loading...
Loading...
Abstract

Abstract The research problem has been determined through the necessity of the architectural elements and determining their relations to one anther with the aim of studying the shifts that have been taken place in Mosul architecture. The research methodology encompasses the application of this frame to buildings that date back to the various stages of architectural change. Consequently, to find out change that have occurred in Mosul architecture elements and the diachronic relations which testify to either continuity or change in it. The research also embraces the method of collecting data on building samples. These include (20) building samples chosen according to objective criteria. Then, a case study on these samples has been applied using a special formula. In Consequence, results relating to the research hypothesis have testified, together with the finding, significant variance between the architectural phases through the changes that have taken place in the architectural elements. Keyword: Mosul architecture, architectural stages and change.


Article
BEARING CAPACITY OF STEEL FIBROUS CONCRETE
مقاومة الارتكاز للخرسانة الليفية الفولاذية

Loading...
Loading...
Abstract

ABSTRACT This study was carried out to determine the influence of the randomly oriented discrete steel fibres on the bearing capacity of plain concrete through testing concentrically loaded 150mm square prisms. The concrete strength, ratio of total area to loaded area, height of prisms, dimensions and fibre percentage were varied throughout the investigation. It was found that the bearing capacity increases with the concrete strength and the ratio of the total to loaded area both for the plain and for the fibrous concrete. It was also found that the bearing capacity of steel fibrous concrete was significantly higher than that of unreinforced concrete, and showed ductile mode of failure and retained their integrity also at failure. It was also found that the bearing capacity of fibrous concrete increases with the aspect ratio of the used fibres. Prediction of the bearing capacity both for the plain and fibrous concrete using the limit theorems of perfect plasticity showed fair agreement with the experimental results. KEYWORDS: Bearing capacity, concrete, limit theorem, plasticity, steel


Article
Al–Sulafani: Non linear behavior of steel fibrous prestressed frames under C.L Non Linear Behavior of Steel Fibrous Prestressed Frames under Cyclic Loads
السلوك غير الخطي للهياكل الخرسانية الليفية المسبقة الجهد تحت تأثير الاحمال الدورية

Loading...
Loading...
Abstract

Abstract This paper presents a numerical model which is capable of predicting the behavior of fibrous prestressed concrete beams and frames subjected to cyclic loads. The stiffness method with the effective secant stiffness is used here in analyzing plane structures, while the analysis of member cross sections that are subjected to cyclic loads is carried out in combination with the layered section approach. Material nonlinearity has been taken in to consideration through the analysis of these sections. This method deals only with axial forces and bending moments neglecting the effect of shear forces. The study presents a program written with MATLAB language that analyzes structures by the STIFFNESS method and divides the cross sections into small layers in order to utilize the nonlinearity of the stress distribution along the section depth. The results at each section are moments, curvatures, displacements, forces, stresses and strains under each load cycle. A cyclic model for fibrous concrete subjected to uniaxial compression or tension has been proposed. Also the cyclic model of Menegotto and Pinto for conventional and prestressing steel has been adopted. Full bond between steel and concrete is assumed. The study shows that the prestresssing force in concrete members has reduced the ductility or capacity of energy dissipation, while a noticeable increase in the member failure load is recorded. Moreover, the existence of steel fibers in concrete enhances its stiffness, delays the cracks The scheme of and then narrows their openings in tension zone and decreases their negative effect. the layered section presents more reliable stress distribution on the cross section of the concrete members. Keywords: Concrete, Cyclic Load, Frames, Prestress , Steel fiber.


Article
A STUDY OF THE EFFECT OF DYES WASTE WATER OF TEXTILEON THE ENGINEERING PROPERTIES OF CLAYEY SOIL
دراسة تأثير مطروحات مياه اصباغ معامل الغزل و النسيج على الخصائص الهندسية للتربة الطينية

Authors: Ibrahim M. Al-kiki
Pages: 14-26
Loading...
Loading...
Abstract

the effect of waste from textiles dyeing operation on the engineering properties of Expansive clayey soil .The tested soil was obtained from of Al- Yarmook district-Mosul-City, which be described as light brown stiff clay ,an inorganic type with high plasticity (CH) , It contains (38%) clay size particles (

Keywords


Article
EFFECT OF AIRFLOW RATE AND SUBMERGENCE OF DIFFUSERS ON OXYGEN TRANSFER CAPACITY OF DIFFUSED AERATION SYSTEMS
ثأثير كل من كمية الهواء و عمق الناشرات على قابلية انتقال الاوكسجين قي منظومات التهوية بأستخدام الهواء المضغوط

Authors: Dr. Kossay K. Al-Ahmady
Pages: 27-38
Loading...
Loading...
Abstract

Abstract Oxygen transfer capacity has greatest influence on activated sludge performance. In this study, experimental procedure is carried out to determine the effect of airflow rate and the level of diffusers submergence, on the oxygen transfer rate of diffused air systems. In addition, a number of readings were also collected from published papers. The data were selected to cover various scales of plants and operating conditions. After sorting out, all data were treated and then combined to the experimental readings in order to expand the applicability of the results. Individual mathematical models to describe the effect of each parameter were also derived. The results of the study showed that, increasing the airflow rate at fixed water depth and diffusers submergence enlarge the oxygenation capacity of the system. The equation, which controls this relationship, is linear. At diffusers submergence of 4.6 m, the slope of the equation was 11.8. With reduce the depth of diffusers to about 0.4 m; the slope of equation was decrease to 2.3. At constant airflow rate, the depth of diffusers has a significant effect on both of the oxygenation capacity and oxygen transfer efficiency of the system. Exponentional form of equation is shown to be efficient in expressing the relationship between the submergence and the oxygenation capacity. At 0.4 m, diffusers submergence, the oxygen transfer efficiency was 1.8 whereas; this value is rising to about 11.5 at 4.6m submergence. Keywords :Oxygen transfer capacity, diffused aeration, airflow rate, diffusers submergence, KLa


Article
ELECTRICAL STRESS CONCENTRATION AT THE TERMINALS OF M.V. & H.V. XLPE CABLES
تركيز الاجهادات الكهربائية عند منطقة الاطراف لقابلوات البولي اثيلين متقاطع الاواصر ذوات الفولتية المتوسطة و العالية

Loading...
Loading...
Abstract

Abstract Longitudinal and radial stresses in a M.V. and H.V. cables through terminals are computed using Schwarz Christoffel transformation for field sketching. The terminals and associated cable are rated at 11KV, 33KV and 132KV a.c insulated by cross–linked polyethylene (XLPE). The electrical field sketching at the cable terminations is carried out theoretically and the results are confirmed by experiments. It seems that the maximum stresses occurs in the cable insulation and the maximum longitudinal stresses along the screened outer surface of the cross-linked polyethylene (XLPE) insulation occurs between the cable and the termination center. The results show that the maximum longitudinal stress is many times the oncorrespding maximum radial values. Key Words: Stress distribution for XLPE cable, Termination of XLPE cables


Article
New Analysis to Measure the Capacitance and Conductance of MOS Structure
تحليلات حديثة لقياس التسعة والتوصيلية في تركيبة ال (MOS)

Loading...
Loading...
Abstract

Abstract : In this research thin film layers have been prepared at alternate layers of resistive and dielectric deposited on appropriate substrates to form four – terminal RY- NR network. If the gate of the MOS structures deposited as a strip of resistor film like NiCr, the MOS structure can be analyzed as R-Y-NR network. A method of analysis has been proposed to measure the shunt capacitance and the shunt conductance of certain MOS samples. Matlab program has been used to compute shunt capacitance and shunt conductance at different frequencies. The results computed by this method have been compared with the results obtained by LCR meter method and showed perfect coincident with each other. Keywords: Thin Film R-Y-NR Network; MOS R-Y-NR Network


Article
Single Chip DWT-IDWT Processor Design with VHDL
تصميم معالج للتحويل المويجي المقطع باستخدام لغة وصف الدوائر المتكاملة ذات السرعة الفائقة

Loading...
Loading...
Abstract

Abstract: frames under C.L The applications of Discrete Wavelet Transform necessitate fast computation. Full-custom VLSI devices (ASIC) have been used for fast though expensive implementations of DWT. Field-Programmable Gate Array (FPGA) architectures offer economical but area-constrained implementation of DWT. The present paper proposes an important issues on the design and simulation of ASIC and FPGA architectures for 1-D DWT as well as inverse DWT on a single chip using VHDL simulation tools. The design of the programmable chip that can be used as 1-D DWT or IDWT is introduced based on two quadrature mirror filters (QMF), one used with DWT (decomposition) and other used with IDWT. The design is modular; the chip can easily be worked as DWT or IDWT with ability of selecting one of the four corresponding types of QMF wavelet filters (Daubechies 1, 2, 3 and 4). The first chip is implemented and simulated using FPGA for two word lengths 8-bit and 12-bit respectively. The results show a clock speed of 66.2 MHz for 8-bit, and 55 MHz for 12-bit. While the design of ASIC chip validate a clock speeds 85.5 MHz and 59.2 MHz for 8-bit and 12-bit respectively. Simulation results have established that the higher word length increase accuracy but at the expense of higher designed size and longest combinational logic between two storage elements. This means increasing the length of critical path as result of complexity which decrease the maximum speed clock. Keywords: VHDL, Wavelet, FPGA, Architecture.

Keywords

Keywords: VHDL --- Wavelet --- FPGA --- Architecture


Article
through Porous Medium Enclosing a Rectangular Isothermal Body
دراسة عددية لانتقال الحرارة بالحمل ىالطبيعي على جسم مستطيل الشكل ثابت الحرارة و محاط بوسط مسامي

Loading...
Loading...
Abstract

Abstract: Steady free convection through a porous medium around a rectangular isothermal body has been numerically investigated. The isothermal body is kept at constant low temperature and the porous medium has an impermeable rectangular boundaries. The cavity wall of porous material has a constant high temperature. The full governing equations (momentum an energy equation) have been solved for range of values of the governing parameters by using the finite difference method and covered a wide range of modified Rayleigh number (Ra) (0-500) with different sizes of isothermal body. Results are presented in terms of the streamlines and isotherms to show the behavior of the flow and temperature fields. This study shows that the Nusselt number (Nu) is a strong function of the modified Rayleigh number, the isothermal body size and boundary conditions. For certain range of Ra, the rate of heat transfer decreases when the flow divided into primary and secondary cells

Keywords


Article
Theoretical and Practical Evaluation of Plastic Deformation and Straining Throughout Cupping the Shells of Domestic LPG Cylinders
التقييم النظري و العملي للتشوه اللدن و الانفعال خلال تشكيل هياكل اسطوانات الغاز السائل المنزلية

Loading...
Loading...
Abstract

Summary This paper covers the theoretical and practical evaluation of straining which arise due to stressing, and plastic deformation during the deep drawing process of the production of the shells for LPG cylinders, as well as the process description and application. Therefore the study includes experimental work in the field of metal drawing in stages for different depths to tabulate the radial metal movement and changes in shell thickness and diameter. As the annealing treatment has an important role in the production sequence, so samples of metal used in producing the domestic LPG cylinder were heat treated in different situations to study the influence of an annealing operation on the metal (its microstructure, metallurgical, and mechanical properties

Keywords

Table of content: volume: issue: