Table of content

ALNAHRAIN JOURNAL FOR ENGINEERING SCIENCES

مجلة النهرين للعلوم الهندسية

ISSN: 25219154 / eISSN 25219162
Publisher: Al-Nahrain University
Faculty: Engineering
Language: Arabic and English

This journal is Open Access

About

AlNhrain Journal for Engineering Sciences is a refereed scientific engineering journal published by the College of Engineering, Nahrain University two times per year. The journal publishes the scientific output of researchers from Iraq and abroad in the fields of architectural, chemical, civil, computer, electrical, information technology, laser and optoelectronics, mechanical and medical engineering as well as in related fields. Papers written in Arabic and English are accepted and they are subjected to proper evaluation and accordingly classified as follows:
• Original research papers and papers on novel design, analysis or construction methods of great value to the engineers which include basic and practical results.
• Short communications or short discussions on papers which have already appeared in the journal provided that whose text should not exceed 800 words.

The material of the paper should not violate any intellectual property right of any person or entity and should not contain any subject matter that contravenes any laws and should meet ethical standards applicable to the research discipline.

Loading...
Contact info

Editor-in-Chief
College of Engineering Journal
Al-Nahrain University
P.O. Box 64040 , Al-Jadyriah
Baghdad-Iraq.
e-mail: journal.engineering@nahrain-eng.org
jourengnah@gmail.com
Phone: +964 (0) 7817 202 662

Table of content: 2011 volume:14 issue:2

Article
Diagnosis of the problems in vocabulary curriculum within the jurisdiction of Architectural engineering in Iraq
تشخيص المشاكل الخاصة بمفردات المناهج الدراسية في اختصاص الهندسة المعمارية في العراق

Loading...
Loading...
Abstract

the fact that architecture is the embodiment of a material (physical) to the direction of a certain intellectual (philosophy (become a study in architectural engineering associated with a large number of phenomena, starting from the properties of materials to the principles or fundamentals of visual perception and everything related to human thought and philosophy, and because of that the academic vocabulary curriculum for the stages of the initial, & the post graduate studies varied and in result we found a difference in the nature of the knowledge problems facing the student in the architectural engineering according to the stage and to vocabulary in terms of structuring the problem or the complexity or in the field of construction and therefore different requirements to the solutions of those problems, by type, The research diagnose the nature of some of those knowledge problems that student face and concluded that most of the curriculum vocabulary in Architectural engineering includes ill-structural problems like( Decision –Making Problem), (Diagnosis-solution problems),( Case analysis problems), in addition to ( Design problems) and in result their solutions based adapters between groups of parameters and standards which require from the problem solver whether student or professor having a knowledge of multiple fields before they begin drafting solutions, and the key solutions to these ill-structural problems achieved by reconstruct the space problem in order to simplified the problem components

Keywords


Article
Color and structure of communication in the architecture of traditional and contemporary Iraqi
اللون وبُنيته الاتصالية في العمارة العراقية التقليدية والمعاصرة

Loading...
Loading...
Abstract

Color is one of the formal construction elements and expressive dimension of the built environment, and is significant through the interaction of a group of actors in the formal construction to him, was reflected in the trends and theories of contemporary architecture. However, the architecture of Iraq have suffered and still suffer from poverty chromatic and clear as a result of lack of familiarity with the science-based accredited in building the color, which called for "clarifying the nature of the actors in the process of building the color of the structure of communication in architecture in general and architecture Iraqi traditional and contemporary, in particular" to represent the research problem. The research aims to "to reveal the actors in the process of building a color as a means of communication can verify that the privacy of the color composition of Iraq's contemporary architecture." Research was to study aspects of synthetic and analytical to the color as a communication with a view to determining the nature of its structure in architecture Iraqi accordance with the questionnaire prepared for that as a tool for testing, research found to identify the most important elements of building color in architecture traditional Iraqi and how it relates to the specificity determinants of the natural and cultural rights to be taken into account when study of any system for the color of the buildings that can communicate with any orientation of the building within the concept of Iraqi contemporary civilization.

Keywords


Article
Effect of Using Recycled Local Solid Waste Materials On Creep Properties of Asphalt Mixtures
تأثير استخدام المواد المخلفة المحلية على خصائص الزحف للخلطات الإسفلتية

Loading...
Loading...
Abstract

Abstract Numerous waste materials result from manufacturing operations in industries. The purpose of this study was to investigate the effect of these waste materials on physical properties of asphalt cement and on surface layer of hot mix asphalt pavement. Asphalt cement with penetration grade (40-50) and 19 mm aggregate maximum size gradation is used in this study with Optimum asphalt content 4.9 %. at the desired temperature of (25˚C).Two types of waste materials crushed glass and sawyer wood (both retained on sieve no. 200) with four percentages (0%, 3%, 6%, and 9% by weight of total aggregate) are used. The mixes are tested by using creep test. From the experimental work, it can be seen that more benefits when additive waste glass or sawyer wood luck improved mechanical (physical) and rheological properties for asphalt paving mixture.


Article
Stacking Sequence Optimization Based on Deflection and Stress using Genetic Algorithms and Finite Difference for Simply Supported Square Laminate Plate Under Uniform Distributed Load
أمثلية السلاسل المتراكمة المعتمدة على التشوه والاجهاد باستخدام الخوارزميات الوراثية مع تحليل الفروق المحددة لصفيحة رقائقية مربعة مدعومة دعم بسيط تحت تاثير حمل موزع منتظم

Loading...
Loading...
Abstract

In this paper, the optimization and increasing of the stiffness of squareplate, numerical simulation of laminate composite plate using genetic algorithms with finite difference analyses, in which applied to the design variables of the objective functions of the stacking sequence are studied. The plates have been evaluated with actual condition of problem such as distributed load,under simply supported boundary condition with different number of layers (5, 10, 20, 30, 50) and different stiffness ratios (E1/E2) 5, 10, 20, 30, 50. The effects of fiber orientation, number of layers and stiffness ratios on the deflection and stress response of symmetric of classical laminated composite plate subjected to uniformly pressure load (flexural loading) are presented. The maximum deflection and stress are the major parameters that were taken into account in the plate design. Then obtain the optimal suitable stacking sequence orientation of composite plate that gives a small maximum deflection and maximum stress of central point of the plate which represent the main aim in this work. The results were compared with ANSYS software results and obtain a good agreement.


Article
Evaluation of the Fatigue behavior for the polymer matrix composite and hybrid composite
تقيم سلوك الإعياء للمواد المركبة والمواد الهجينة من البوليمر

Loading...
Loading...
Abstract

The characteristics of polymer materials which are containing ceramic particles has been investigated to find the information and data to give good expectation for composite behavior under fatigue damage. In this research epoxy resin reinforced by ceramic particles (Alumina, silicon carbide and graphite), with reinforcement particles size range between 36 and 45 Micrometer and 1 to 10 micrometer for graphite. The structure has been investigated under stress-strain and fatigue damage to evaluate the bound strength between the matrix and reinforcement phase. This examinations lead to discover new Techniques which is applied during preparation of the composite materials. Basically this methodology will reduce the porosity which develops during mixing and solidification process, as a result the bound strength between the polymer and the reinforcement will increase in another word the properties of the composite improve. The fatigue damage in the composites is complex because, it is combine between several damages, first matrix cracking and second debonding of the particles. The fatigue damage shows that pure epoxy give initial stress (26.2) MPa and its final failure is at 221 hundred thousand cycles in which the stress indicated is to be equal to 20 MPa. for the composite contain epoxy with aluminand slicon carbide, the initial stress is equal to (32.2) MPa and its final failure is at 910 hundred thousand cycles in which the stress indicated is to be equal to 23 MPa. In the case of graphite reinforcement it is clear there is reduction in the value of maximum stress. The microstructure examination shows that the cracks stop at the reinforcement particles or goes around them. Crack propagation is thereby inhibited. This means that the fracture toughness of the composite increased

Keywords


Article
Mechanical Behavior for Polymer Matrix Composite Reinforced By Copper Powder
السلوك الميكانيكي للمواد المركبة البوليمرية المدعمة بمسحوق النحاس

Loading...
Loading...
Abstract

The mechanical properties of commercial epoxide resin type conipox 77Z have been investigated both unfilled and filled with varying weight fraction of copper particles. The values of Young’s modulus, modulus of rigidity, yield stress, tensile strength, shear strength, flexural strength, fracture energy, impact strength, coefficient of friction and the S/N curves and the fatigue strength or fatigue limit have been studied at room temperature (25°C) to a certain the influence of weight fraction of copper powder to epoxy resin (0%, 5%, 10% and 15%) and found that increasing the weight fraction of copper powder to epoxy for different particle sizes leads to an increase in modulus of elasticity (E), modulus of rigidity (G), tensile yield stress and ultimate tensile strength but at the same time will decrease the compression yield stress, fracture energy and the impact strength. Finally the reinforced epoxy with (15%) was found to be improving the mechanical properties for composite material, where the modulus of elasticity and the modulus of rigidity increased and the coefficient of friction of the composite material to steel decreased.

Keywords

PMC --- Reinforced copper --- fatigue --- tensile


Article
Modeling of Dissolved Oxygen Profile in a Slurry Reactor
"نمذجة توزيع ألاوكسجين المذاب في المفاعل ألاحيائي (البايولوجي) الثلاثي الطور"

Loading...
Loading...
Abstract

A mathematical model for a slurry bioreactor was proposed to describe oxygen utilization rate and concentration profiles along the reactor for reactants and products in the bubbly flow regime. The model consisted of transient differential equations representing mass transfer and kinetics of oxygen, biomass and substrates in the liquid phase. The model was validated by comparing with experimental work of other authors and a good agreement was obtained, the absolute average error between model and experimental results was 4.3%. The effects of various operating parameters on the concentration profile of oxygen and biomass were investigated theoretically. The dissolved oxygen concentration was significantly affected by the superficial liquid velocity than that by superficial gas velocity. Unsteady state concentration profile of oxygen showed different behaviors gas and liquid.


Article
Studying The Effect of Zircon Dioxide on The Corrosion Resistance of Porcelain Enamel
دراسة تأثير أوكسيد الزركونيوم على مقاومة تأكل الطلاء البورسليني

Loading...
Loading...
Abstract

Among various coating systems for industrial and engineering applications, glass–ceramic coatings have advantages of chemical inertness, high temperature stability and superior mechanical properties such as abrasion, impact etc as compared to other coating materials. Besides imparting required functional properties such as heat, abrasion and corrosion resistance to suit particular end use requirements, the glass–ceramic coatings in general also provide good adherence, defect free surface and refractoriness. This research tends to produce a cheep and effective glass- ceramic coating from glass cullet and different percent of crystallization agents ZrO2, and study the final corrosion resistance properties of them. After several set of acid resistance testing at temperatures range (25, 50, 75,100,125 oC) it has been found that porcelain enamel with (4 wt %) ZrO2 has the best acid corrosion resistance.


Article
Design of an Online authentication protocol using both fingerprint identification and identity based cryptography
تصميم نظام توثيق لشبكة الويب باستخدام تقنية بصمة الاصبع و نظام التشفير بواسطة الهوية

Loading...
Loading...
Abstract

One of the major limitations with the authentication of users via the internet is the inherent lack of security of traditional authentication techniques, passwords, PIN numbers and cookies. With the current development of the biometric fingerprint technology market, the possibility of identifying someone online has been addressed. However, recent publication in this field shows that the lack of aliveness detection mechanism in fingerprint sensors technology, may be used to mold and reproduce exact copy of a fingerprint with its detailed shape and extended characteristics (e.g. minutiae points’ location). The presented authentication system provides the solution to this problem by using ID-based cryptography. A complete online authentication system is developed presenting the registration, login and authentication phases. The security analysis of the system is also presented.


Article
Saturation Gain Characteristics of Quantum-Well Semiconductor Optical Amplifier
خصائص الربح المشبعه للمضخم شبه الموصل البصري ذو البئر الكمي

Loading...
Loading...
Abstract

Recently, there is an increasing interest on quantum well (QW) semiconductor optical amplifier in optical communications and optical signal processing applications. This paper addresses the dependence of saturation power on QW structure parameters. Expressions are given to assess this dependency and the results indicate that the saturation power is a decreasing function of number of wells, well thickness, and amplifier length and it is almost independent of barrier thickness.

Table of content: volume: issue: