@article { author = {Waheed, Mohammed and Majeed, Sadir}, title = {The Mechanical Properties of Aluminum Matrix Composites}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {517-523}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.16}, abstract = {This work is production of aluminum matrix composite by powder metallurgy method .The samples have done when aluminum powder was used as a matrix in purity of (9.99%) and silicon carbide(α-SiC) as reinforcement material, the particle sizes were used which (125μm) at weight percentage (7.5% - 10% - 15%) from silicon carbide for each particle size. The purpose is to improve the hardness and wear properties of matrix .It was found that the hardness is increased with increment of the amount of added particles, due to the hardness of silicon carbid particles. From the wear test, it is found that the wear resistance increase with increasing the weight percentage of SiC particles, but the wear rate increase when the applied load increase for all the particles size and additional percentage. Also, it is found that when the sliding velocity increases, the wear rate also increases, but the best results were found in samples reinforced with (SiC) particles}, keywords = {Sic,Hardness,wear test,powder metallurgy}, url = {https://etj.uotechnology.edu.iq/article_43222.html}, eprint = {https://etj.uotechnology.edu.iq/article_43222_b9c04f5dce9eb512c1c15fb87db3005f.pdf} } @article { author = {Dhiaa, Belqis and Majdy, Hassan and Mohammed, Raghad}, title = {Study the Effect of Ultra Violet Rays (UV) on Some Mechanical Properties of Epoxy Composites}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {524-538}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.17}, abstract = {Epoxy resin type (Ep-10) was used as a matrix for composite materials,with Glass fibers, aluminum powder and silica powder as reinforcement with volume fraction (Vf= 30%). Four types of composites were prepared:-(1) Epoxy reinforced with glass fiber and aluminum powder.(2) Epoxy reinforced with glass fiber and silica powder.(3) Epoxy reinforced with aluminum powder.(4) Epoxy reinforced with silica powder.Research subject was implied studying some of mechanical properties forcomposite materials that used in the research, in different weathering conditions including Ultraviolet Radiation (UV). Mechanical properties that be studied is: Young’s modulus (E), Impact Strength (I.S.), and Compressive Strength (C.S.). The results showed that the bestmechanical properties were for hybrid composites reinforced with fibers and particles (Ep+G.F.+Al) ,(Ep+G.F.+SiO2), such that, they have higher: Young’s modulus, Impact strength, and compressive strength in all weathering conditions}, keywords = {}, url = {https://etj.uotechnology.edu.iq/article_43223.html}, eprint = {https://etj.uotechnology.edu.iq/article_43223_f268b14ffe3264e03b0438eed1fe7ff5.pdf} } @article { author = {Al-Kandi, Ghaida}, title = {Survey of Ground and Surface Water Quality in AL-Khadimiya Town}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {539-556}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.18}, abstract = {According to the lack of water in AL-Khadimiya town due to the sabotagejustify happened in the infrastructure of town like water distribution system of potable water as a result the residents of the concerned town used the ground water in all life activities as second source.13 sampling wells have been chosen in that area ,4 sample collected from Tiger river each sample represented different area around AL-Khadimiya and chemical study included for the soil of different depth to examine their water . The experimental works at the laboratory shows the increase in Turbidity value .Hardness of calcium and magnesium, chloride, sulphat &Bacteria account (Coli form) the high values of the pervious testes made water an portable and withrespect to the irrigation of plants, it is accepted with medium salt &Chlorides, the spiel result at the laboratory tests for the Tiger river is not acceptable for drinking not for irrigation is accepted.}, keywords = {}, url = {https://etj.uotechnology.edu.iq/article_43224.html}, eprint = {https://etj.uotechnology.edu.iq/article_43224_78535ae9f67206d78c7d5d06fa96d7c8.pdf} } @article { author = {Jihad, Israa}, title = {The Properties of Produced Concrete by Using Fine Aggregate with Sulphate Content Higher Than Iraqi Specification Limits}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {557-569}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.19}, abstract = {The sulphate problem in fine aggregate increases with time in Iraq and the construction companies became face a lot of difficulties to find fine aggregate within the specification with regard to sulphate content. This paper studies the possibility of adjusting fine aggregate content in concrete mixes to facilitate using fine aggregate with sulphate content higher than the Iraqi specification limit (0.5%), but the total sulphate content of the mix will be within the specification (I Q S 45, 1984). One reference mix is used in this study with fine aggregate conformed to the specification for sulphate content ,and three other mixes are used with different fine aggregate content and also different sulphate content .Some tests are conducted for these produced mixes to fined their mechanical properties. This study shows the ability of using fine aggregate with sulphate content up to(2.33%) to produce mixes with a compressive strength ,splitting tensile strength ,and modulus of rapture not less than (80%),(94%), (84%) respectively as compared with the refrence mixe at age of (180) days .}, keywords = {internal sulphate in concrete,sulphate in fine aggregate}, url = {https://etj.uotechnology.edu.iq/article_43225.html}, eprint = {https://etj.uotechnology.edu.iq/article_43225_6daa5cff6637af348c0b1d19775c6be2.pdf} } @article { author = {Al_Mamouri, Mohammed and Al-Sultani, Kazem and Obaid, Masar}, title = {Effect Chlorophyll Pigment on Specific Gravity And Tensile Properties For Natural Rubber And Protect It From UV Ray}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {570-577}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.20}, abstract = {The aim of this research to use extracted natural pigments which extracted plants such as chlorophyll as plasticizer and stabilizer material by simple method. The sample of rubber was prepared with adding different percent from chlorophyll pigment (0-25)pphr to study the effect of this material on properties of natural rubber. When we added chlorophyll pigment, we fined chlorophyll act as plasticizer thatinteract between rubber chains and decrease interaction molecular forces that decrease specific gravity (from 0.997 to 0.986), tensile strength (from 13.295 to 8.384)MPa, modulus of elasticity (from 2.745 to 1.312) MPa. This mean is chlorophyll pigment is doing as lubricant material to facility the moving of molecules chain one on anther and act as stabilizer that protect rubber from UV light because itabsorbed UV light and transmit it to no harm heat .Therefore this work exists with a good replacement for synthetics plasticizers and stabilizers materials avoiding their toxicity and their highly cost.}, keywords = {}, url = {https://etj.uotechnology.edu.iq/article_43226.html}, eprint = {https://etj.uotechnology.edu.iq/article_43226_a434903616d4f9dc0b4daebfc55e58d7.pdf} } @article { author = {T. Younis, Miqdad and Y. Nasser, Nidhal}, title = {Over Voltage Transient Protection Network Design}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2711-2718}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.1}, abstract = {Transient over-voltage caused by lighting, switching large inductive loads,couples on to data communication or instrumentation signal lines and introduce series fault alarm conditions and damage instrumentation electronics. Most of the semi-conductor devices and other sensitive electronic equipment are easily damaged with transients of high amplitude with fast rise time, with threshold energy levels in the range of micro joules to mill joules. Hence, it is very essential to protect the system by hardening the input power supply lines,input/output data and communication lines utilizing various transient suppression techniques to make the system immune to transients. If an electronic system designer intend to build a protection circuit a custom design will be desirable, as the interface or inter-connection could be more effective for the intended environment.}, keywords = {Transient over voltage,protection,suppression,let through voltage}, url = {https://etj.uotechnology.edu.iq/article_43118.html}, eprint = {https://etj.uotechnology.edu.iq/article_43118_08ce0351c3d412702421789731b8a3d4.pdf} } @article { author = {Abdul Kareem, Fikrat}, title = {Performance Analysis of Nonlinearities in WDM Systems}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2719-2729}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.2}, abstract = {Wavelength division multiplexing (WDM) is a technology that enables thetransmission of several optical signals simultaneously at different carrier wavelengths on a single fiber and the separation of the signals by wavelength at the receiving node. While WDM is very attractive, it has some disadvantages also. One such disadvantage is the appearance of fiber nonlinearities. With the use of multiple channels, several miliwatts are injected into the fiber. Such high powers lead to theappearance of different nonlinear effects in the fiber, mainly the Stimulated Raman scattering (SRS), Stimulated Brillouin scattering (SBS), Four wave mixing (FWM), and the Cross Phase Modulation (CPM). These nonlinear effects lead to the degradation of system performance.In this work the performance analysis of nonlinearities in the WDM systems was implemented using Mat lab-(7).}, keywords = {}, url = {https://etj.uotechnology.edu.iq/article_43121.html}, eprint = {https://etj.uotechnology.edu.iq/article_43121_163d1b3f290b011512b1d21a1d40447d.pdf} } @article { author = {H. Hussein, Hussein and T. Shlash, Kais}, title = {A Correlation Between Dynamic and Static Pile Load Test Results}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2730-2737}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.3}, abstract = {Three selected bored piles executed at Basrah area were tested both bystatic and dynamic pile test procedures in order to correlate their results when evaluating the piles capacities. The correlation showed that the results are close to each other in terms of load- settlement relations, but on the other hand, end bearing capacity and skin friction values obtained by the dynamics tests are far from the real behavior of piles. The reason may be due to lack of experience ofcrew that supervises the dynamic tests. They have to practice more dynamic tests and should build accumulated knowledge about the dynamic method of testing piles. The time is still early for the dynamic tests to replace the classical static test when evaluating piles capacities.}, keywords = {Pile Test,Static load test,Dynamic load test}, url = {https://etj.uotechnology.edu.iq/article_43131.html}, eprint = {https://etj.uotechnology.edu.iq/article_43131_15d480e1b2759de3cdc1baf370bd82e6.pdf} } @article { author = {Kadhim Salih, Raghad}, title = {On The Nonlinear Key Generator Design Using Unit-Step and Trace Functions}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2738-2750}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.4}, abstract = {The paper presents a proposed method with an algorithm which has beenwritten in Matlab language for designing a nonlinear key generator, which is denoted by (US-TR), using unit-step function and trace function from Galois field of order 2N (i.e. GF(2N), (N≥2)) to Galois field of order 2 (GF(2)). The proposed generator produces a binary sequence of period (2N -1)where N is a composite number, with high degree of complexity and good randomness properties. The advantage of the new nonlinear generator is the output sequence which has highdegree of complexity to increase the security of this generator concerning the designed feature that limit the ability of anti-jammer when it uses as a key in cipher systems or in spread spectrum digital communication system. This paper has useful properties of the trace function. Moreover, Illustrative examples are given for determining the output sequence with its complexity of the proposed generator and good results are obtained}, keywords = {Nonlinear generator,Unit,Step function,Trace function and Complexity}, url = {https://etj.uotechnology.edu.iq/article_43132.html}, eprint = {https://etj.uotechnology.edu.iq/article_43132_349a873bcaf791313cdb3bc38fb62b0d.pdf} } @article { author = {al khalaq F. Hammod, Abd and A. A. Hafad, Sanaa and A. Hussain, Huda}, title = {Study Of The Chemical Durability And Hazardous Ionic Leaching Of(Soda-Lime) Glass}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2751-2759}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.5}, abstract = {Huge amounts of glass materials being applied in medical, pharmaceuticaland chemical aqueous solutions; this requires the study of chemical stability of glass at the exposed surfaces with these solutions where the leaching takes place. The leaching of the glass ions will transport these ions to the solutions stored in the glass containers; leading to changes in the chemical composition in the order of part per million that causes hazardous effect with time. The present work investigates the leaching chemical properties of the soda-lime Iraqi glass containers. The effect of the pH of contact solution andannealing of glass on leaching rates is studied. Ionic leaching shows lower rate with PH of the solutions at the ‘safe zone’: (6>PH>8.5). Annealing increases the leaching rates and reduces of the chemical durability of glass. Increasing annealing time led to further increase the leaching rate. In addition, the increase in the exposed surface area also increases leaching rates.}, keywords = {chemical durability,ionic leaching,Soda,Lime,glass,annealing}, url = {https://etj.uotechnology.edu.iq/article_43136.html}, eprint = {https://etj.uotechnology.edu.iq/article_43136_5e7e114697fd4812fe22cf1ed02c380b.pdf} } @article { author = {Z. Khelifa, Muhannad}, title = {The Dynamic Coefficients and Elastic Deformation with Thermal Effect For Cylindrical Pivot Tilting 5-Pad Bearing}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2760-2774}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.6}, abstract = {The paper describes the results of theoretical study of the tilting pad bearing consist of five pads each pad can be titling 0.2o about a cylindrical pivot at high speed of rotating journal. The total oil film thickness includes elastic deformation with thermal effect had been estimated. By using finite element method to solve the Reynolds equation for dynamic load, from this solution generated pressure,components of oil film forces and moments are expressed as functions of journal coordinates, dynamic coefficients (stiffness and damping coefficients) these coefficients of oil film can be determined by differentiation of the oil film force finally elastic deformation of pad surface was obtained. This paper also includes the study of manyparameters such as pivot offset, preload factor, direction of load (load on pad and load between load) and dynamic coefficients were presented as functions of Sommerfeld number. Results show that good bearing performance when the pad preload factor is increase and pivot offset decreases.}, keywords = {Tilting pads bearing,Cylindrical pivot,Dynamic coefficients,Elastic deformation,Pivot offset}, url = {https://etj.uotechnology.edu.iq/article_43179.html}, eprint = {https://etj.uotechnology.edu.iq/article_43179_a1019009a5054db2aa3555d98bbcfdf7.pdf} } @article { author = {Sabah Abdul Ameer Al-Araji, Ahmed}, title = {PI Controller for The Heating Process in The Real Time System Based on LAB VIEW 8.2 Packages}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2775-2791}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.7}, abstract = {This paper experimentally investigates the control of the heating process in a water tank. A trial and error method is used to find the best system response depend on the tuning parameters of the PI controller based on a Matlab simulation package in order to replace these parameters in the real time digital PI controller system basedLabVIEW package. The PI control action in the real time system technique shows more oscillation in comparison to that the PI simulation control action. Simulation and real time results for heating process experiment has successful for maintaining water tank temperature.}, keywords = {}, url = {https://etj.uotechnology.edu.iq/article_43181.html}, eprint = {https://etj.uotechnology.edu.iq/article_43181_574ea4a155ffdab216f16bf27a462e98.pdf} } @article { author = {M. Ali, Jamal and A. Sameh, Shatha and M. Abbas, Qasim}, title = {The corrosion of (Fe,Zn,Cu) Metals in 3.5%Nacl solution under Different Flow Conditions}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2792-2805}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.8}, abstract = {As the practical importance of protection of industrial equipments fromcorrosion the need arises to study the corrosion of different metals as Carbon steel, Zinc and Copper measured their corrosion current and potentials have been investigated in 3.5% NaCl solution at 40ºC for different flow conditions (Re = 5000, 10000 and 15000), by using commercial metal pipe as test specimens cylindrical. Potentiodynamic polarization studies have been performed for single metals. It was found experimentally that the corrosion of metals (Fe, Zn, Cu) is underdiffusion control since the corrosion current density (iL) increases and corrosion potential (Ecorr.) shifts to less negative with increasing velocity, the limiting diffusion current density is independent of the nature of the cathode material, but it depends onthe Reynolds number. The corrosion current density of metals (Fe, Zn, Cu), shows a good agreements with other works, and reasonable agreement with Culburn –Chilton and Paulson correlations are also observed at different Re.No.}, keywords = {}, url = {https://etj.uotechnology.edu.iq/article_43183.html}, eprint = {https://etj.uotechnology.edu.iq/article_43183_a0e0159d8e8db634dd906e4a673e27f1.pdf} } @article { author = {N. Abdullah, Sarcot and Abdulbaki Jumaa, Bassim and A. Mohamad, Omar}, title = {Effect of Using Header Compression Method in TCP/IP Protocol Over HDLC in SCADA System}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2806-2813}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.9}, abstract = {Most of the header information remains constant over the life-time of the connection. For TCP connection many fields are constant and others change with small values. To initiate compression of the headers of a packet stream, a full header is transmitted over the link. The compressor and decompressor store most fields of this full header as reference. The reference consists of the fields of the headers whose values are constant and thus need not be sent over the link at all, or change little between consecutive headers so that it uses fewer bits to send the difference from the previous value compared to sending the absolute value. To improve interactive response time and to decrease the header overhead on the system we used the method of Compressing Protocol Headers (TCP/IP). Also it is used to compress the HDLC header. The simulated communication protocols have been tested between two PCs and the time delay, throughput and utilization have been measured.}, keywords = {TCP,SCADA,UDP,HDLC,AES}, url = {https://etj.uotechnology.edu.iq/article_43184.html}, eprint = {https://etj.uotechnology.edu.iq/article_43184_fd5761ec498ceb596dd78589b8185a15.pdf} } @article { author = {A. Oleiwi, Majid and J. Humaidi, Amjed}, title = {Speed Control of Hydraulic Motor System with Swashplate DC-Controlled Pump}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2814-2834}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.10}, abstract = {In a previous study, speed-controlled hydraulic motor system hasemployed a DC motor for changing the swashplate angle of a variabledisplacement piston pump. However, the speed control has been performed by a flow modulation valve which is permitted to bypassing the flow of the hydraulic motor when the speed exceeds the set value. In the present work, another speed control configuration has been proposed with the pump and hydraulic motor are permitted to perform reversal actions. The conventional proportional, integral and derivative (PID) controller has been introduced to manipulate the speed error suchthat it could achieve the required performance. The specification required by the PID controller is to reach the command speed as fast as possible with minimum peak overshoot. Also, the effectiveness of the suggested controller against changing of system parameters is considered. The modeling of the speed control system components is detailedly presented, including the dynamic of swashplate,and one can easily see that the system is of a nonlinear nature. The state space representation of the complete system has been developed and the program codes are listed inside an m-file, which is instantaneously called by an s-function within SIMULINK library.}, keywords = {Variable displacement piston pump,hydraulic motor,PID controller,Matlab,function}, url = {https://etj.uotechnology.edu.iq/article_43185.html}, eprint = {https://etj.uotechnology.edu.iq/article_43185_39d7e42dfefa25b2f3629dd2d1cf049b.pdf} } @article { author = {E. Aldokheily, Mohsin}, title = {Thermal and Electrical Properties of Silica-Mullite-Grqphite Composite Fired at Low Temperature}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2835-2843}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.11}, abstract = {Silica - mullite powder sieved through 100 mesh, mixed with graphite atcertain proportions and placed in a steel mould, then subjected to ≈ 40Mpa .After air- drying for 24 hours the specimen buried in carbon and fired at 1150 ◦C overnight. DC resistance was measured by the method of two probes. The percolation threshold was not sharp , instead it starts from 10.5% graphite ratio up to 21% were it resembles the conductivity of graphite alone . Resistance and reactance analysis were carried out at three frequencies (0.55, 1.5, 5.0) kHz. The specimen was subjected to heating/cooling cycle and the change in DC resistance value (TCR) was found to be less than 1%for each 100◦C rise in temperature}, keywords = {}, url = {https://etj.uotechnology.edu.iq/article_43186.html}, eprint = {https://etj.uotechnology.edu.iq/article_43186_bdbf13c12f3049aea0ca5e6d20b589b1.pdf} } @article { author = {Z. Dawood, Yasmeen and G. Rasheed, Bassam and H. Al-Hamdani, Ali}, title = {Formation and Characteristics Study of Nanostractured Solar Cell}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2844-2852}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.12}, abstract = {Electrochemical and photoelectrochemical etching technique have beenemployed to produce nanostructured solar cell. Various preparation conditions were examined. The I-V characteristics measurements were adopted to study effects of these parameters on the solar cell efficiency. We found that when shorter laser wavelength used to illuminate the porous layer during the etching process, the conversion efficiency of the solar cell increases . While doping the porous layer with phosphorous increases the nanostructured solar cell efficiencyby 30 %}, keywords = {porous silicon,solar cell,photoelectrochemical etching}, url = {https://etj.uotechnology.edu.iq/article_43187.html}, eprint = {https://etj.uotechnology.edu.iq/article_43187_bc72c644e0a80d0d5dbacc01373a3a5a.pdf} } @article { author = {S. Sabri, Laith and Shanshool, Jabir}, title = {Removal of Phenol Pollutants by Modification Molecular Sieves 13X}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2853-2862}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.13}, abstract = {Molecular sieves type 13X was modified by treatment with saturated solution of urea or thiourea and adding of sodium silicate as binder to give homogeneous admixture in approximate weight percent, 20% urea or thiourea, 30% binder, and 50% MS13X. The samples were dried and shaped in cylindrical particles of about 5mm diameter and 4-8mm length. The FTIR studies show some interaction between the added urea and thiourea with the original substrates. These are mainly hydrogen band type interactions through –NH2 moiety with –OH group of framework oxygen inthe substrate or with adsorbed water. The urea displayed more significant interaction with MS13X than thiourea. Molecular sieve 13X and its admixtures with urea and thiourea showed good ability to remove phenol from water. The urea modified sample, which has the largest surface area, was the best adsorbent for phenol followed by thiourea treated sample. Excellent degree of phenol removal, greater than98% was achieved by using 0.2 l/h flow rate of 10ppm phenolic solution and 56cm bed length at 300C. The increasing of inlet phenol concentration in water affected largely the driving force and the rate of adsorption, resulted also in higher capacities. While the percentage removal of phenol was decreased by fixed other operating conditions}, keywords = {Molecular Sieves,urea,thiourea,Phenol Pollutant,adsorption}, url = {https://etj.uotechnology.edu.iq/article_43188.html}, eprint = {https://etj.uotechnology.edu.iq/article_43188_c39703912458ba1d95251591150bfd5f.pdf} } @article { author = {A. Al-Bayati, Sataa and S. Habeeb, Zainab}, title = {Evaluation of Horizontal Flow Roughing Filtration Performance}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2863-2878}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.14}, abstract = {The HRF was studied by using pilot plant. This pilot plant was designedand applied in Al – Wehda Water Treatment Plant which treats the raw water of Tigris River in Al – Karradah in Baghdad city. Design characteristics of the pilot HRF are 5.5m length × 1m width × 1m depth , the HRF length consists of inlet ( 0.5 m ) , outlet ( 0.5 m ) and three compartments ( 2m , 1.5m and 1m ) filled with three different size of gravel ( 15mm , 10mm and 5mm ) respectively . The HRF was continuously operated (24 h in a day) during the period from 15/May / 2007 to 15/ July / 2007. Operated done in two stages. In the first stage, raw water (free from any addition) was used, with three different flow rate 1.3, 1.1 and 0.9 m3/h. While in the second stage, coagulated water (raw water + alum) was used, with flow rate 1.3 m3/h. To assess the performance of HRF, the required tests were carried out. These tests are Turbidity, S.S, Temperature, pH and Bacteriological tests. The results of tests were analyzed statistically. The mean ofremoval efficiency of turbidity for first stage with discharges 1.3 , 1.1 and 0.9 m3/h is 92% , 94% and 95% respectively , and for second stage is 97% . These results indicate the high performance of HRF in turbidity removal.}, keywords = {HRF,Turbidity removal,Suspended Solid,influent discharge,Temp,temperature}, url = {https://etj.uotechnology.edu.iq/article_43220.html}, eprint = {https://etj.uotechnology.edu.iq/article_43220_70e69ab4f9669d40168065ed105b0454.pdf} } @article { author = {Saleh Ahmed, Mohamed and Ali Nasser, Haidar and Kadim Hmood, Jassim}, title = {Design, Construction and Testing A Laser Power Comparator}, journal = {Engineering and Technology Journal}, volume = {27}, number = {15}, pages = {2878-2884}, year = {2009}, publisher = {University of Technology-Iraq}, issn = {1681-6900}, eissn = {2412-0758}, doi = {10.30684/etj.27.15.15}, abstract = {A laser power comparator prototype that can be utilized in laboratories has been designed constructed and tested. The system consists of three main electronic circuits: the laser comparator electronic circuit, sign detector and phase inverting circuit, and an analog-to-digital readout display circuit. The comparator has two detectors each receives a particular input signal. Two input signals will be compared and the output will be displayed on a digital readout (or on an oscilloscope). Power difference up to 0.1mW is achieved.}, keywords = {}, url = {https://etj.uotechnology.edu.iq/article_43221.html}, eprint = {https://etj.uotechnology.edu.iq/article_43221_6d026ca2e0925341ac26615ce9b9aa1d.pdf} }