ORIGINAL_ARTICLE
تشكيل واجهات المجمعات السكنية واثره في المشهد الحضري لمدينة بغداد
The selection of this research ,was based on the following facts:- The deformation that tookplace in the formal relationships for the residential complexes inBaghdad due to many factors such as: political, economical, social and other factors. So, theresearch tended to select samples from the residential complexes in Baghdad.- There are many futuristic plans to construct huge number of housing units in the form ofresidential complexes, and there are fears from repeating the same mistakes which accompanied theEuropean experiment after and the industrial revolution and the world wars where there was biginterest in mass production of resdential units without taking care of the importance of quality. Theinterest in formal relations for the residential collections was neglected due to the concentration onconcentruction of maximum number of housing units in short period of time to overcome theshortage in this essential sector.The analysis of the results of the field studies shows that the current residential complexes aresuffering from great formal disorder in addition to the fact that the formal relations of the buildingselevations for the residential complexes does not reflect the features of these complexes and itsrelations with the neighboring urban scape, for many reasons. It appear that the designer bear thegreat responsibility for this weakness and deformations of those relationships by making designswhich neglected the formal relations and interested by the functional factors only, in addition tobearing the responsibility of leaving great margin to the inhabitant to do any changes that he wanton the elevations of the housing units, it also appears that the inhabitant had played an importantrole in the deformation of the formal relations of the residential complexes, throughout the changeshe made, also by using the elevation for other functions which affected negativaty on the housingbuildings and affected on the entire urban scape of Baghdad.
https://etj.uotechnology.edu.iq/article_26553_a44689dcfaec846f3a1385f8a6ebb7d5.pdf
2008-05-28
223
237
10.30684/etj.29.5.13
ORIGINAL_ARTICLE
لحام المونة بإستخدام القوس الكهربائي لربط الفولاذ المقاوم للصدأ
In this research brazing process was done by using ElectricalArc as a heating source to join stainless steel sheets Type (304L)together. The brazing process was accomplished by using silverbrazing filler metal tetra composition alloy (Ag-Cu-Zn-Cd). Thebrazing variables were heat quantity (as welding electrical current)and clearance between the two joined base metals. After finishingbrazing there were three destructive tests to find out mechanical andphase transformation which happened during the operation. Thefirst was tensile test and the second was micro-hardness testing bypreparation specimens and testing them and the third test was microexamination test by taking micro photos of sections of brazingjoints maximum tensile strength was 185 MPa at current of (15)ampere with clearance of (0.125) millimeter for stainless steel sheetthickness of (1.5) millimeter and the prepared specimens whivh (V)chamfered were batter than non chamfered specim
https://etj.uotechnology.edu.iq/article_26554_a1984c3afa588fe9d622167885f5646a.pdf
2008-05-28
238
251
10.30684/etj.29.5.14
ORIGINAL_ARTICLE
دراسة طيفية لنقلِ الطاقةِ والعملياتِ المتنافسةِ في أصباغِ الليزر (كومارين 522 و رودامين 101)
The transfer of excitation energy between the molecules of compounds is aneffective and important phenomenon in extensive application, and particularly inthe development of dye laser. The energy transfer between two lasingcompound, Coumarin 522 (donor) and Rhodamine 101 (acceptor) has beeninvestigated in order to achieve the operational conditions for efficient lasing atdesired wavelengths. Absorption spectrum of each compound of differentconcentrations (10-4-10-6) molarty with ethanol at room temperature were measuredprior to and after mixing. Wide absorption spectral bandwidth was observed in themixture that increasing concentration shifts the absorption spectrum peak towardslonger wavelengths.The maximum absorption bandwidths in the mixture rangingbetween (340-650)nm were obtained at concentrations (10-4) molarty for eachcompound with a mixing ratio (1:1) depending on the donor concentrations. Thisrange provides a wide – scale pumping source for lasers
https://etj.uotechnology.edu.iq/article_26555_9b3aeba6248349aa05ff227033bf3743.pdf
2008-05-28
252
262
10.30684/etj.29.5.15
ORIGINAL_ARTICLE
تحسين تقطير المياه باستخدام سخان ماء شمسي منزلي
This article conclude study the effect of preheating inlet water supplied toa single effect solar water still on its production and its performance andalso the effect of glass cover cooling by air and water flow on its productionand performance. the experimental results done for the period Feb. to Jun.2005 at Baghdad –Iraq on a solar water still of 0.4 m2 which was combinedwith a solar water heater of 4 m2 show 3.5 - 5 % enhancement in itsproduction and of 30 – 40% and 13.5 – 15 % production enhancement forglass cover cooling by air and water flow rates respectively.
https://etj.uotechnology.edu.iq/article_26556_f7a0c38a1f9937c2f87d0e259ffd24d0.pdf
2008-05-28
263
272
10.30684/etj.29.5.16
ORIGINAL_ARTICLE
Effect of Temperature on The Solvent Extraction of Cobalt(II), Nickel(II), and Copper(II) Metal Ions by o-diphenylamino Benzoic Acid
The solvent extraction of cobalt, nickel, and copper ions by the ligand odiphenylaminobenzoic acid in chloroform at 273, 293, and 318 K has beeninvestigated. The values of pH1/2 and kex as well as the values for the thermodynamicparameters ΔG, ΔH, and ΔS have been calculated.
https://etj.uotechnology.edu.iq/article_26539_d11caf7cc6d0754cfee7c8eb633326a7.pdf
2008-05-28
496
500
10.30684/etj.29.5.1
Solvent extraction
diphenylamino benzoic acid
cobalt
nickel
and copper
Matheel
D. Al-Sabti
1
AUTHOR
ORIGINAL_ARTICLE
Effect of Zinc Phosphating on Corrosion Control for Carbon Steel Sheets
For many years, phosphating is one of the recognized, Improvement ofcarbon steel for corrosion by using phosphating method, has been made. Itcan augment the design process and present a number of experimentallydetermined factors that should be applied to present work. This workapproach to protection for bare carbon steel, different factor e.g., thickness,time of phosphating adhesion force, protection potential with phosphatingand protection potential with phosphating and painting.It is found that phosphating coating is proper to protect the carbon steel.The results conform to the theory of protection.
https://etj.uotechnology.edu.iq/article_26541_5ee64e7a0f1561adcb41054fc2ee9a78.pdf
2008-05-28
501
511
10.30684/etj.29.5.2
Mohammed
Hliyil Hafiz
1
AUTHOR
Junan
Sttar Kashan
2
AUTHOR
Ali
Shaker Kani
3
AUTHOR
ORIGINAL_ARTICLE
Optical Constants of Zinc Telluride Thin Films in the Visible and Near-Infrared Regions
In this study, thin films of ZnTe were deposited on glass substrates usingvacuum evaporation technique. The optical measurements on the deposited filmswere performed to determine the transmission spectrum and the absorption spectraas a function of incident wavelength. As well, optical parameters, such asextinction coefficient, value and type of energy gap, type of the dominantabsorption processes, real and complex refractive index as functions of incidentphoton energy, were determined. This study may present better understanding forthe optical properties of ZnTe thin films and their devices in order to enhance theircharacteristics and improve their efficiencies.
https://etj.uotechnology.edu.iq/article_26543_6d03d6be1a3bf338afbfd9d93a155661.pdf
2008-05-28
512
519
10.30684/etj.29.5.3
ZnTe devices
Thin films
Optical Constants
Optical dispersion energy
Khalid
Z. Yahiya
1
AUTHOR
Evan
T. Salem
2
AUTHOR
Muhammad
S. Muhammad
3
AUTHOR
ORIGINAL_ARTICLE
X-Ray Radiography of Alumina to Kovar Joining
In this work alumina samples were used to be joined with kovar alloy by usingdifferent filler types . Fillers were formed with different concentrations of Silver ,Copper , and Titanium powdered metals . These fillers where by mixing powdersand compacting by hydraulic press , and sintering by tube furnace with argonatmosphere of 1100 oC and time of 60 min. Alumina/Kovar assemblies were joinedin vacuum furnace of pressure of 2x10-4 torr at temperature of 850 oC and time of20 min. .X-ray radiography was used evaluates and detect the defect in contact areaThrtee types of defects were detected namely craqcks , voids and Non uniformity .Shear test was achieved to determine joint strength . Correlation between shear test(destructive test) and X- ray radiography (Non destructive test) was found .
https://etj.uotechnology.edu.iq/article_26544_8023b6e48d2d277d5e40a9164c0eb048.pdf
2008-05-28
520
527
10.30684/etj.29.5.4
Abdulhadi
K.Jedran
1
AUTHOR
Zareh
A.Sarkiss
2
AUTHOR
Selma
M.Hussain
3
AUTHOR
ORIGINAL_ARTICLE
Effect of water on the properties of some polymeric composites
The effect of water was studied on some physical and mechanical propertiesincluding (Roughness, Hardness, Compression Strength), and diffusion coefficientwas calculated using Ficks’ 2nd law for a polymeric composite materialsPVC+carbon black, Epoxy+Al powder, Epoxy + E-glass (chapped)), withvolume fraction Vf=30% reinforcement for all specimens, results showed thenegative effect of water on these properties which is differed between onespecimen and other, PVC+CB was affected more than Epoxy+E-glass thenEpoxy+Al powder and the diffusion coefficient (D) was less for Epoxy+Al thenPVC+CB and the less value was for Epoxy + E-glass .
https://etj.uotechnology.edu.iq/article_26545_d56d9c8777f8f1de3ccae4848f819349.pdf
2008-05-28
528
535
10.30684/etj.29.5.5
Balqees
M.Dhyae
1
AUTHOR
Khansaa
D.Salman
2
AUTHOR
ORIGINAL_ARTICLE
A Comparative Study Of Roller And Hammer Compacted Asphalt Concrete
In this work, Dense and Gap graded Asphalt Concrete samples were compacted in thelaboratory using two modes, the first one was the traditional Marshall method of hammercompaction; Cylindrical specimens were constructed using three different Asphaltpercentages; While the second mode was the TRRL roller wheel compaction, slab samples of(30×30×7) cm were constructed using the same Asphalt percentages, core specimens wereobtained from the slabs. All of the Asphalt Concrete specimens were subjected to Marshallproperties determination, indirect tensile stress test, Hveem stability and cohesion tests. Acomparative analysis of testing results was conducted. It was concluded that Dense gradedAsphalt Concrete shows superior quality whencompared to Gap graded one when roller wheel compaction was adopted. Gap graded AsphaltConcrete shows higher quality when Marshall Hammer compaction was adopted.
https://etj.uotechnology.edu.iq/article_26546_e31f8c3770cf2d5151f9af69cacb6d66.pdf
2008-05-28
536
543
10.30684/etj.29.5.6
Ayman
A. Abdulmawjod
1
AUTHOR
Saad
Issa Sarsam
2
AUTHOR
ORIGINAL_ARTICLE
Thermal Characteristics Of Ceramic Packed Bed
Convection heat transfer in horizontal channel filled with saturated packedbed has been studied numerically using finite difference technique. The channelwall is heated at constant heat flux and packed with a fluid – saturated sphericalceramic for diameter ratio (0.287). Air , helium and carbon dioxide are used asworking fluid at Reynold number ranging (100 – 2500). The results show asignificant effect of varying prandtle number on heat transfer rate and frictionfactor at different Reynold number. The radial temperature profile increase as theprandtle number decrease. The heat transfer rate increase as the prandtle numberincrease , Carbon dioxide is greater than for air and the last is greater than that forhelium at the same flow conditions . Friction factor proportional inversely withprandtl number. New Correlations are obtained in this work:Nuav = 24.548 Re0.238 Pr0.0787F = 39.1917 (d Re1−φ)0.901
https://etj.uotechnology.edu.iq/article_26547_454bc4eb9575da9b1deb338d43127f10.pdf
2008-05-28
544
551
10.30684/etj.29.5.7
Ceramic Packed Bed
heat transfer
Raghad
H. Hilal
1
AUTHOR
ORIGINAL_ARTICLE
Privacy Preserving for Data Mining Applications
The results of data Mining (DM) such as association rules, classes, clusters,etc, will be readily available for working team. So the mining will penetrate theprivacy of sensitive data and makes the stolen of the knowledge resulted muchmore easily. The main objective of the proposed system is preserving the privacyof data mining, that will done by developing algorithms for modifying, encryptingand distributing the original data in the database to be mined. So we ensure theprivacy of data (original data in database that will be mined) and the privacy ofknowledge (the association rules extracted from mined database) even after themining process has taken place. The problem that arises when confidentialinformation can be derived from released data by unauthorized users can be solved.Keyword:
https://etj.uotechnology.edu.iq/article_26548_734efbe5a6b91ab5053ae38f77a535c5.pdf
2008-05-28
552
564
10.30684/etj.29.5.8
Data Mining
privacy
sensitive databases
protection techniques
Twofish encryption
Soukaena
Hassan Hashem
1
AUTHOR
Alaa
H. AL-Hamami
2
University of Technology-Iraq, Baghdad, Iraq
AUTHOR
ORIGINAL_ARTICLE
Interference of Scouring action between Pier and Abutment: Primary Approach
Presented here are the results of a limited experimental program dealing withthe problem describing the scour , which is formed around bridge pier neighboringabutment . To achieve this the results shown , generally, that the scour depends ona distance interaction between pier and abutment . A modification factor deals withthis distance presented as a multiplicative factor used with an empirical predictiveformula of scour depth around bridge pier .
https://etj.uotechnology.edu.iq/article_26549_5649bf87a76714a05f3ad66b91b8e39e.pdf
2008-05-28
565
569
10.30684/etj.29.5.9
Pier
scour
Bridge
Jaafar
Sadeq Maatooq
1
AUTHOR
ORIGINAL_ARTICLE
Study Optoelectronic Properties of Ag2O Heterojunction Prepered by Thermal Oxidation Technique
Highly (101)-oriented p-Ag2O thin film with high electrical resistivilywas grown by thermal oxidation (TO) on clean monocrystalline p-type Siwithout any post- deposition annealing. From optical transmittance andabsorptance data, the direct optical band gap was found to be 1.4eV. Theelectrical and photovoltaic properties of Ag2O/Si isotope heterojunctionwere examined in the absence of any buffer layer. Ideality factor ofheterojunction was found to be 3.9. Photoresponse result revealed that thereare two peaks located at. 750 nm and 900nm .
https://etj.uotechnology.edu.iq/article_26550_09d9dfd352d500153782446ba0c9a2d0.pdf
2008-05-28
570
578
10.30684/etj.29.5.10
Heterojunction
Thermal oxidation
photovoltaic
Khalid
Z. Yahia
1
AUTHOR
ORIGINAL_ARTICLE
The Effect of Magnetic Water on Dissolving Kidney Stones
Present study considers physical characterization of magnetized water indissolving Calcium Oxalate which is the constituent of the predominate kidneystones. The physical parameters like Total Dissolved Salts ( TDS),pH value,electrical conductivity and surface tension have been evaluated in magnetizedCalcium oxalate solution. This analysis shows that the Surface tension decreaseswith increasing magnetic field intensity and exposing time, while the other threeparameters increase.
https://etj.uotechnology.edu.iq/article_26551_c62614685a8cd809ff7951cf8e821b9f.pdf
2008-05-28
579
587
10.30684/etj.29.5.11
Ali
M . Mousa
1
AUTHOR
Ahmed
S. Hmed
2
AUTHOR
ORIGINAL_ARTICLE
Formation and Operation Parameters of SiC Electrodes in Laser Discharge
In this work, laser discharge electrodes were fabricated using SiCcomposite as a base material. The electrodes were also fabricated by addingcopper to the composite material under different formation conditions. Theseelectrodes were employed to operate discharge system of a TEA-CO2 laser.Operation parameters were studied considering several influences such asreduction factor, grain size, forming pressure, sintering time andtemperature, and copper added ratio. Also, the electrical characteristics, suchas conductivity, electric discharge uniformity and current pulse shape, wereintroduced. It is aimed to optimize the experimental conditions leading toproduce the discharge electrodes suitable for stable and long-life operation oflaser system.
https://etj.uotechnology.edu.iq/article_26552_3aa384003b1f3ce538e9e3f75ae1ea99.pdf
2008-05-28
588
601
10.30684/etj.29.5.12
Silicon Carbide
High power laser
high power electronics
Adawiya
J. Haider
1
AUTHOR
Hassan
W. Hilou
2
AUTHOR
Aqeel
S. Rahim
3
AUTHOR