University of Technology-IraqEngineering and Technology Journal1681-6900374A20190425Study the Microstructure and Mechanical Properties of High Chromium White Cast Iron (HCWCI) under Different Martempering Quenching Mediums11211916877910.30684/etj.37.4A.1ENAli H.AtaiwiUniversity of Technology, Materials Engineering DepartmentZainab A.BettiUniversity of Technology, Materials Engineering DepartmentJournal Article20190114<span>The aim of this study is to find an alternative quenching medium for the ordinary nitrate mixture that is cheaper and more available in Iraqi markets. So to obtain the suitable medium , the effect of different quenching mediums used in martempering treatment on the microstructure and mechanical properties of high chromium white cast iron was studied . This type of cast iron is used in mining ,crushing and cement plants as mill liners so it is subjected to extreme conditions of wear and impact that eventually cause failure . In this study, two types of quenching mediums were used in martempering treatment: (50% Sodium hydroxide + 50 % potassium hydroxide) mixture and (50% Sodium nitrate + 50 % potassium nitrate) mixture with different quenching intervals. It is also found that both of the quenching mediums produce higher hardness values at 350°C martempering temperature for 4 hr quenching time ,but there were several advantages and disadvantages associated with using these two different mediums</span>https://etj.uotechnology.edu.iq/article_168779_4f40690667a72ee91fc06cf2ef09d484.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900374A20190425Development the Physical Properties of Polymeric Blend (SR/ PMMA) by Adding various Types of Nanoparticles, Used for Maxillofacial Prosthesis Applications12012716877810.30684/etj.37.4A.2ENSihama I.SalihMaterials Engineering Department, University of TechnologyJawad K.OleiwiMaterials Engineering Department,University of Technology0000-0001-6918-3085Hajir M.AliMaterials Engineering Department,University of TechnologyJournal Article20190127<span>As maxillofacial defects increased due to cancer; it became necessary to select high-quality prosthetic materials in this field. Silicone rubber is widely used in damaged maxillofacial affected areas replacement surgery as bio material. The aim of this research, prepared a nano composites materials, from polymer blend (silicone rubber: 5% PMMA) reinforced by different types of nano-powders; pomegranate Peels Powder (PPP), Seeds powder of dates Ajwa (SPDA) and TiO2 nano-powders with loading level (0.0, 0.1, 0.2, 0.3 and 0.4%). Some physical properties such as density, water absorption, and Thermo-Physical test, FTIR analysis, as well as, FTIR, antibacterial tests were done on prepared samples. The results showed that the composites material based of polymer blend with optimum percent are of 0.2% of pomegranate Peels Powder (PPP), 0.3% of Seeds powder of dates Ajwa (SPDA) and 0.1% of TiO2 nano-powders that have ideal characteristic. Also for antibacterial tests, polymeric blend composites with optimum percent of this nano-powders show that more antibacterial efficiency against S.aureus bacteria than E.coli bacteria.</span>https://etj.uotechnology.edu.iq/article_168778_cbf51e575dbba053d6b9dcb599572a59.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900374A20190425Experimental Study of 3D printing Density Effect on the Mechanical Properties of the Carbon-Fiber and Polylactic Acid Specimens12813216877610.30684/etj.37.4A.3ENWafa A.SoudUniversity of Technology, Mechanical Eng. Dept.Ihsan A.BaqerMechanical Eng. Dept., University of TechnologyMohammed R.AhmedMechanical Eng. Dept., University of TechnologyJournal Article20190211<span>Two 3D printed materials (Polylactic Acid and Carbon fiber) with variable printing density have been investigated due to their practical uses in the engineering utilization. The effect of printing density composites was studied by the tensile test. The used materials stress-strain curves were analyzed to find modulus of elasticity and ultimate tensile strength of the mentioned materials. The results manifested that the carbon fiber has the highest strength-weight ratio. On the other hand, the carbon fiber showed more ductility than the Polylactic Acid. The results of this paper will be aiding the researchers or engineering students to decide which material is suitable for 3D printing applications.</span>https://etj.uotechnology.edu.iq/article_168776_3512481e650aa062af2223c1a4d45d52.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900374A20190425The Extraction of Alumina from Kaolin13313916877510.30684/etj.37.4A.4ENAlaa H.AliMaterials Engineering Dept., University Of TechnologyMohammed H.AL-TaieMaterials Engineering Dept., University Of TechnologyIhab F.AyoobMaterials Engineering Dept., University Of TechnologyJournal Article20181104<span>Alumina has wide industrial and technological applications that can be extracted from different locations, different methods and materials. Kaolin from Iraq Alduikhla astrologer has used as a raw material source for alumina production. The alumina concentration in the Iraqi kaolin is more than 34% which considered as a good replacement for bauxite rack. Crushing andground is the first process to reduce the kaolin particle size to the micron level which increases the surface area of kaolin.</span><br /><span>The kaolin is heat treated at different temperatures (600, 650, 700 and 750) ̊C for 2 hours to remove some of ithe mpurity like organic materials and crystal water before acid treatment. A different concentration of hydrochloric acid (pH) (0.45, 0.5, 0.55, 0.6 and 0.65) has used for extraction of alumina from kaolin. The reaction between the hydrochloric acid and kaolin has studied at different temperature (30, 60 and 90) ̊C. The extraction of alumina has decreased with increase t inhe reaction temperature. Finally t,,he alumina extraction by this method has characterized using XRD and XRF to investigation the crystal structure and the amount of impurities presented there. The final extracted alumina h isaving cubic crystal structure (γ alumina) with purity above 95%.</span>https://etj.uotechnology.edu.iq/article_168775_07fb2be9869e9b1cbe0c9d28516ecbe7.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900374A20190425Mapping LCLU Using Python Scripting14014716877410.30684/etj.37.4A.5ENOday Z.JasimCivil Engineering Department,
University of Technology Baghdad0000-0003-4020-2953Khalid I.HasoonCivil Engineering Department,
University of Technology BaghdadNoor E.SadiqeCivil Engineering Department,
University of Technology BaghdadJournal Article20190108<span>Land cover land use changes constantly with the time at local, regional, and global scales, therefore, remote sensing provides wide, and broad information for quantifying the location, extent, and variability of change; the reason and processes of change; and the responses to and consequences of change. And considering to the importance of mapping of (LCLU). For that reason this study will focus on the problems arising from the traditional classification (LCLU) that based on spatial resolution only which leads to prediction a thematic map with noisy classes, and using a new method that depend on spectral and spatial resolution to produce an acceptable classification and producing a thematic map with an acceptable database by using artificial neural network (ANN) and python in additional to other program. In this study the methods of classification were studied through using two images for the same study area , rapid eye image which has three spectral bands with high spatial resolution(5m) and Landsat 8 image (high spectral resolution with eight bands), also several programs like ENVI version 5.1, Arc GIS version 10.3, Python 3, and GPS. The result for this research was sensuousness as geometrics accuracy accepted in map production.</span>https://etj.uotechnology.edu.iq/article_168774_1364b2d025bd1ade339ec3ee2e89eb60.pdf