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Multiple Access Chua Chaotic Communication System Using Real Orthogonal Matrix Approach, Ali Radhi Aug 2026

Multiple Access Chua Chaotic Communication System Using Real Orthogonal Matrix Approach, Ali Radhi

Engineering and Technology Journal

An alternative to traditional Pseudo-Noise (PN)-Sequences, one-dimension (1D) orthogonal chaotic map sequences, and three dimensional (3D) continuous chaotic systems (x,y,z) are generated by orthonormal Gram-Schmidt process. A new Orthogonal Chua Chaotic Sequences OCCSs-based Direct-Sequence/Spread-Spectrum-Code Division Multiple Access (DS/SS-CDMA) system is proposed. The proposed system combines the 3D Chua chaotic system with Real Orthogonal Matrix Approach (ROMA). Comparing to previous sequences, the OCCSs inherit all beneficial features of Chua's Circuit and ROMA scheme, such as the best correlation properties, higher capacity, Low Probability Interception (LPI), reliable security and good orthogonality. The three analytical Bit Error Rates (BERs) expressions for each orthogonal …

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Effect Of Waiting Time Before Re-Vibration On Mechanical Properties Of Fiber Reinforced Concrete, Aseel Abdulridha Aug 2026

Effect Of Waiting Time Before Re-Vibration On Mechanical Properties Of Fiber Reinforced Concrete, Aseel Abdulridha

Engineering and Technology Journal

A knowledge of the concrete vibration after casting have led to improve the mechanical properties of concrete, reduce the deformations due to creep and shrinkage and reduce the concrete permeability. At the Structural and Material Laboratories- Building and Construction Engineering Department, University of Technology, series experimental tests on prisms, cubes and cylinders were carried out to investigate the effect of waiting time after initial vibration on the flexural-tensile strength, compressive strength and splitting tensile strength of fiber reinforced concrete. The variables considered in this study were; the amount of steel fiber and waiting time after initial vibration. The test results …

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Sliding Mode Controller Design For Flexible Joint Robot, Ivan Gorial Aug 2026

Sliding Mode Controller Design For Flexible Joint Robot, Ivan Gorial

Engineering and Technology Journal

This paper suggests a flexible joint robot operated by brushed Direct Current (DC) motor model. Due to complex high-order, nonlinear dynamical system which operating under parameter’s uncertainty, sliding mode control (SMC) used to solve this problem of control the flexible joint robot. The SMC method is identified as one of the effective method to design robust control for the flexible joint robot, which based on t using a Low Pass Filter (LPF) with suitable time constant. The mathematical model is presented clearly and the simulations together with their analysis are done using MATLAB software. Simulation results display the efficacy of …

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Effect Of Corrosion Time On Critical Buckling Load Of Aisi 304 Columns, Hussain Al-Alkawi, Samih Al-Najjar Aug 2026

Effect Of Corrosion Time On Critical Buckling Load Of Aisi 304 Columns, Hussain Al-Alkawi, Samih Al-Najjar

Engineering and Technology Journal

In this work Corrosion buckling interaction behavior of AISI 304 stainless steel circular columns was investigated. Long and intermediate columns diameter of (6 mm) are tested in as received and corroded condition. Corroded columns are tested after embedded it in soil for different times. Rotating buckling machine test was used to evaluate the critical buckling load (pcr) under dynamic compression loads. By using Perry Robertson formula, experimental work results are compared. The results showed that increasing in corrosion time (embedding time), the reduction in critical buckling load increases also. Maximum reduction of buckling load value are (2.28%, 1.37%) for long …

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High Rate Data Processing System Of 6x6 Mimo_Ofdm Using Fpga Technique With Spatial Algorithm, Muthna Fadhil Aug 2026

High Rate Data Processing System Of 6x6 Mimo_Ofdm Using Fpga Technique With Spatial Algorithm, Muthna Fadhil

Engineering and Technology Journal

OFDM has high spectral Performance and pliability in multipath channel effects while MIMO use another strategy for saving power of transmitter by using multi in multi out antennas to make throughput processing in high efficiency. The transceiver MIMO OFDM implemented on an FPGA typeSpartan3 XC3S200 with proper algorithm, Invoke method and QPSK modulation. The project prospective to improve the transceiver operations in terms of data transmission in high speed and saving power for wireless communication system take in consideration the cost of implementation hardware. In the result registered throughput data rate 425 Mbps using spatial algorithm (ICA with SD algorithm) …

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Effect Of Cfrp Layer Orientation On The Behavior Of Shear-Strengthened Steel Plate Girders, Mohammed Hamood, Wael Abdulsahib, Ali Abdullah Aug 2026

Effect Of Cfrp Layer Orientation On The Behavior Of Shear-Strengthened Steel Plate Girders, Mohammed Hamood, Wael Abdulsahib, Ali Abdullah

Engineering and Technology Journal

The present paper investigates experimentally the impacts of fiber layer orientation on the structural behavior of CFRP strengthened steel-plated girders that are subjected to shear. Three of these girders were considered strengthened girders whereas the last one represents the reference girder. Each of the four steel-plated girders was tested aside and in different periods of time using the shear buckling test. A point load was applied to the center of the top flange of the four girders using Avery hydraulic machine. A laminated carbon fiber reinforced polymer sheet (CFRP) was fully adhesively attached to the web area of the three …

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Study The Effect Of Nano-Al2o3 And Fiber Glass On Mechanical And Physical Properties Of Pmma Composites For Prosthetic Denture, Qahtan Hamad Aug 2026

Study The Effect Of Nano-Al2o3 And Fiber Glass On Mechanical And Physical Properties Of Pmma Composites For Prosthetic Denture, Qahtan Hamad

Engineering and Technology Journal

In the present research, investigate the effect of adding some reinforcing materials which include nano-aluminum oxide (nano-Al2O3) particles that added with different volume fractions of (1%, 2%, 3% and 4%), and random fiber glass that added with fix volume fractions of (4%), into the PMMA matrix as new cold cure resin, and study some mechanical and physical properties of these hybrid laminated composite as prosthesis denture base material. Specimens’ of this project were prepared by using (Hand Lay-Up) method to form a hybrid laminated composites materials. The mechanical tests were performed on these specimens include (tensile test, impact test, flexural …

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Removal Of Cobalt (Co(Ii)) From Aqueous Solution By Amino Functionalized Sba-15, Anaam Sabri, Talib Albayati, Dalia Abed Aug 2026

Removal Of Cobalt (Co(Ii)) From Aqueous Solution By Amino Functionalized Sba-15, Anaam Sabri, Talib Albayati, Dalia Abed

Engineering and Technology Journal

Mesoporous silica SBA-15 material was synthesized and functionalized by post synthesis method with amino functional group (3-aminopropyltriethoxysilane) to investigate its potential use as an adsorbent for cobalt (Co(II)) removal from aqueous solution. Several characterization methods were used for identifying the material characteristics before and after functionalization, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Batch adsorption experiments were conducted and different variables that affected the removal of cobalt ions were studied, such as pH (1-6), contact time (0-150min), initial concentration (20-120mg/L) and adsorbent dose (0.025-0.3g). It was found that amino functional group was …

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Effect Of Nano Bn Addition On The Properties Of An Aluminum Metal Matrix Composite, Fadhal Hashim, Niveen Abdulkader, Nibras Jasim Aug 2026

Effect Of Nano Bn Addition On The Properties Of An Aluminum Metal Matrix Composite, Fadhal Hashim, Niveen Abdulkader, Nibras Jasim

Engineering and Technology Journal

In the present work, the wear rate and hardness of recycled Aluminum alloy based metal matrix composite that reinforced with nano Boron Nitride with (2%, 4%, 6%, and 8%) weight percentage with 33 nm particle size were evaluated. A stir casting process was applied to fabricate composite the mechanical and metallurgical characteristics of the fabricated composite were evaluated through the hardness and wear test. The results indicate that the value of hardness increased and wear rate decreased with increasing the BN percentage due to high surface area to weight ratio for nanoparticles.

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Parametric Optimization Of Wedm In Machining Hss (8x200), Athraa Ahmed Aug 2026

Parametric Optimization Of Wedm In Machining Hss (8x200), Athraa Ahmed

Engineering and Technology Journal

Nontraditional machining processes are used for machining too hard, brittle and strong conductive materials. The aim of this research is to achieve an economic and efficient machining process in machining HSS by using wire cut machine. Experimental investigations were conducted on WEDM with using different machining parameters such as (pulse duration (μs), pulse interval (μs), Servo feed and Servo voltage (V)). The experiments were designed according to DOE, which is done by using Taguchi design parameter method to investigate the optimum machining parameters, which gives the best values for MRR and CS in order to achieve an economic and efficient …

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Fatigue Life And Surface Hardening Investigation Of Aluminum Shot Peening Process, Kayser Ameen Aug 2026

Fatigue Life And Surface Hardening Investigation Of Aluminum Shot Peening Process, Kayser Ameen

Engineering and Technology Journal

Two different tests are used in order to analyze the shot peening foraluminum 6061-T6 alloys. Stress amplitude versus fatigue life (S-N curves) are established experimentally using different shot peening ball size (three diameters of balls are used in this paper are 1.5, 3, and 3.5 mm). Also the hardening via Vickers hardnessis evaluated due to shot peening experimentally and by ANSYS software, the three dimensional finite element model of a square plate shot by ball is demonstrates the application of shot peened of hardening surface.The influences of the ball’s diameter on the hardening and S-N curves are studied. The results …

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Speed Reference Tracking For Separately Excited Dc Motor Based Anfis And Hysteresis Current Control Techniques, Omar Mahmood Aug 2026

Speed Reference Tracking For Separately Excited Dc Motor Based Anfis And Hysteresis Current Control Techniques, Omar Mahmood

Engineering and Technology Journal

In this work, a closed loop control system has designed to control the speed of separately excited direct current motor (SEDCM) using Fuzzy (Mamdani and Sugeno) and an Adaptive Neuro - Fuzzy techniques (ANFIS). The action of these control techniques is to produce the reference armature current that has fed to the hysterics current controller (HCC) that produces the required gating signal to a Buck chopper .Different load conditions has been applied to the motor to obtain many mode of operation, the speed held constant at the required references values using both fuzzy (Mamdani-type and Sugeno-type) and ANFIS techniques. The …

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A Comparison Study Of Underwater And Land Flexible Manipulators, Mohammed Mohammed Aug 2026

A Comparison Study Of Underwater And Land Flexible Manipulators, Mohammed Mohammed

Engineering and Technology Journal

New results for experimental comparison of flexible underwater and land manipulator have studied in this research. A new experimental rig and test basin have designed to present the manipulators behavior. Several electronic devices used to capture the data that relates with land and underwater manipulators. Experimental parts have consisted on studying of hub-angle and vibration of end-point as in-line forces affection under static and moving waters conditions as a distributed flow speeds. The experimental outcomes appeared that the in-line forces influence on land manipulator case is more than the underwater manipulator. The outcomes revealed that angular displacement influence and vibration …

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Study Compression And Impact Properties Of Pmma Reinforced By Natural Fibers Used In Denture, Jawad Oleiwi, Sihama I. Salih, Hwazen Fadhil Aug 2026

Study Compression And Impact Properties Of Pmma Reinforced By Natural Fibers Used In Denture, Jawad Oleiwi, Sihama I. Salih, Hwazen Fadhil

Engineering and Technology Journal

The fracture in dentures prepared from acrylic resin occurs frequently during the accidental damage or service through heavy occlusal force [1]. Impact failures usually occur out of the mouth as a result of accidental dropping due to cleaning, coughing or sneezing or a sudden blow to the denture [2]. This paper is focused on the effect of natural fibers on the mechanical properties of PMMA by changing two parameters (content of fibers and length of fibers). Fibers were treated with alkaline solution to improve the interfacial adhesion. Composite specimens were prepared by using hand lay-up method. The results were showed …

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Evaluation And Improvement Performance Of A Boiler In A Thermal Power Plant Using Artificial Neural Network, Hosham Anead, Khaliid Sultan, Raheel Abd-Kadhum Aug 2026

Evaluation And Improvement Performance Of A Boiler In A Thermal Power Plant Using Artificial Neural Network, Hosham Anead, Khaliid Sultan, Raheel Abd-Kadhum

Engineering and Technology Journal

This research aims to avoid damage in power plant boiler steam generation by using Artificial Neural Network techniques (ANN) to improve the boiler performance. The training and testing using ANN by Back Propagation (BP) algorithm. The inputs to the neural network such factors which include air fuel ratio, water level, flame, gas, pressure and temperature. Control of the optimum input variables represent the output of the neural network. Experimental data is obtained by using an industrial boiler operating at AL-Dura power plant.the method of control by ANN is off – line ,the information of boiler taken from real plant and …

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Influence Of Fracture Parameter On The Shear Lips For 080m40 Carbon Steel In Charpy-V Impact Resistance At Different Temperatures, Thaer Alsultan Aug 2026

Influence Of Fracture Parameter On The Shear Lips For 080m40 Carbon Steel In Charpy-V Impact Resistance At Different Temperatures, Thaer Alsultan

Engineering and Technology Journal

This article examines the correlation between shape of shear lips and temperature change. Impact toughness properties of Standard Charpy-V samples are evaluated at different temperatures for analysis of the energy of fracture of specimens (080M40 Medium Carbon Steel Z3 & Z7 treatment codes). Shear lips are a characteristic sign of the influence of the meso-level mechanisms on the processes of deformation and failure of the material, which is one of the most important property for extending components service life. Therefore, it is important to know the failure of the materials before choosing these steels for producing different machine parts. The …

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Effect Of Current And Duty Factor For Different Electrode Shapes On Material Removal Rate In Edm, Shukry Aghdeab, Nagham Ghazy Aug 2026

Effect Of Current And Duty Factor For Different Electrode Shapes On Material Removal Rate In Edm, Shukry Aghdeab, Nagham Ghazy

Engineering and Technology Journal

This paper discusses the performance of Electrical Discharge Machining (EDM) process by changing the bottom shape of the electrode, including two stages: designing the electrodes by turning process then the resulted electrodes were used to machine the workpiece by EDM. The effect of electrode shape on material removal rate (MRR) has been investigated for material of CK 60 carbon steel for workpiece and material of brass for electrode. The shapes of the electrode bottom were flat, conical (with 90º apex angle) and round (with 8 mm radius) of constant diameter electrode of 16 mm. Experiments were repeated for three current …

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Effect Of Particle Size On Mechanical Properties Of The Recycling Compact Disks Reinforced Epoxy, Shayma Ahmed Aug 2026

Effect Of Particle Size On Mechanical Properties Of The Recycling Compact Disks Reinforced Epoxy, Shayma Ahmed

Engineering and Technology Journal

The recycling of CDs or DVDs (compact disks) as a filler in polymer composites can be used in many engineering applications such as electrical, automobile, and building applications. In the present paper, composite materials were prepared of epoxy resin reinforced with three different particles size (600˂d˂850, 200˂d˂600, d˂200 μm) of recycling of CDs or DVDs (a very thin aluminum layer is used to record information). Hand lay-up technique was conducted to produce composite material samples. Different types of tests, such as tensile, bending, impact, and hardness were applied on these samples. The mechanical characteristics of the composite samples were analyzed. …

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Suggested Methods To Solve The Coils Misalignment For The Biomedical Implants, Saad Mutashar Aug 2026

Suggested Methods To Solve The Coils Misalignment For The Biomedical Implants, Saad Mutashar

Engineering and Technology Journal

One of the major problems of the inductive coupling link in the biomedical implantable devices is the misalignment between coils. This paper produces two simple suggested methods to avoid and reduce the misalignment between two coils. The first one is to split the implanted coil into two identical coils with 450 μH of inductance where the external coil was equal to them in inductance ~ 900μH.  The results show that the received powers are constant and compensated by one of the coils, which provides a stable power at the implant. The second proposed suggestion is to use two separated identical …

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The Relationship Between Data Transfer Rate And Distance In Power Networks Modems, Salih Mahmood Aug 2026

The Relationship Between Data Transfer Rate And Distance In Power Networks Modems, Salih Mahmood

Engineering and Technology Journal

With the rapid growth of communication networks, reliable and economical communication systems are needed and can be implemented in buildings. PLC uses electrical wiring to transmit information and provides high-speed and cheap data communications, such as home networks and Internet access. PLC is a hostile environment for communication, making communication signals spread difficult and experiencing significant challenges such as noise, attenuation and interference. This research focus on the challenges of communications via power lines such as distance and stability. Performance factors are tested and studied through the actual application of communication networks by connecting modems and computers in the network …

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Metal Flow Control In Producing The Non Symmetrical Parts In Deep Drawing Process, Kariem Younis, Adil Jaber Aug 2026

Metal Flow Control In Producing The Non Symmetrical Parts In Deep Drawing Process, Kariem Younis, Adil Jaber

Engineering and Technology Journal

the quality of the cups drawn in the deep drawing process are secured by the rate of metal flow into the die cavity, efficiently control on the metal flow can reduce and eliminate a lot of defects such as wrinkling, tearing and earing especially in the square deep drawing due to the non-uniform stresses induced along die cavity. This control is obtained using a restraining force supplied by blank holder tool or draw beads or both. Therefore this research focuses on the study these parameters numerically and experimentally. Ansys software based on finite element method was used to model and …

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Analytical Comparison On Inductive Wireless Power Transfer System For Biomedical Devices, Suhad Jasim Aug 2026

Analytical Comparison On Inductive Wireless Power Transfer System For Biomedical Devices, Suhad Jasim

Engineering and Technology Journal

This paper presents a comparative analysis for the four basic topologies of inductive link wireless power transmission, thereby allowing designers to select the most appropriate topology according to the requirements of the application. Wireless energy transfer systems applied for diagnostic or monitoring signals in biomedical devices to eliminate the needs for tethering wires or implantable batteries. Inductive link studied as main technique in wireless power transmission for biomedical devices. In various applications, the maximum delivered power and maximum efficiency of an inductive link system are two important factors to be considered. The efficiency expression for power transfer of the four …

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Optimum Site Selection For Groundwater Wells Using Integration Between Gis And Hydrogeophysical Data, Nadia Aziz, Raghad Hasan, Zaidoon Abdulrazzaq Aug 2026

Optimum Site Selection For Groundwater Wells Using Integration Between Gis And Hydrogeophysical Data, Nadia Aziz, Raghad Hasan, Zaidoon Abdulrazzaq

Engineering and Technology Journal

This paper aim to select the best site to drill a groundwater wells by using of Geographic Information System (GIS) as a tool for decision-making. The study conducted in Fadak farm in Bahr Al-Najaf which is located west and southwest of Najaf city, and extends more than (40 km) away from it, to drill a new wells for irrigations usages. The optimal location selected depending on the available hydrogeophysical data includes resistivity, depth, thickness and transmissivity of aquifer. The weighted factor maps generated for the evidence layers were given weights depending on the significance of each parameter, these parameters were …

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Effects Of Enhancement P+ Layer On Igbt Operation, Inmar Ghazi, Hayder Assafli, Wail Nassir Aug 2026

Effects Of Enhancement P+ Layer On Igbt Operation, Inmar Ghazi, Hayder Assafli, Wail Nassir

Engineering and Technology Journal

IGBT (Insulated-gate bipolar transistor), is used widely in high voltage applications, it is very important to realize the doping profile in order to understand the design and the electrical performances of such devices. The performance depends on the layer, doping, and a carrier distribution among each layer. A specific selected layer can be added with precise properties for enhancing the device and increase the low current operate requirement. In this paper, an IGBT device is an enhanced and better performance achieved by the addition of a heavily positive doped intermediate layer. The collector current is decreased from 0.05 mA to …

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Enhancement Of Thermal Storage Properties Of Phase Change Material By Using Metallic Swarf, Abdulkareem Khudhair, Falah Hatem, Dher Mohammed Ridha Aug 2026

Enhancement Of Thermal Storage Properties Of Phase Change Material By Using Metallic Swarf, Abdulkareem Khudhair, Falah Hatem, Dher Mohammed Ridha

Engineering and Technology Journal

The phase change materials (PCM) is commonly used for storage heat as a latent heat, the main disadvantage of this method is slow response time during charging and discharging; this due to the PCM thermal properties. This work studied experimentally the enhancement of thermal properties of PCM by adding various metallic swarf such as copper, aluminum and iron swarf. Metallic swarf used as thermal conductivity promoter to produce modified paraffin wax samples. The addition of the previous enhancers was conducted with a weight fraction of (7.5%, 12.5% and 17.5%) to the whole weight of the mixture. The experimental results showed …

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Proposed Design Against High-Cycle Fatigue Failure Of Metallic Beams Using Lamination, Riyah Kiter Aug 2026

Proposed Design Against High-Cycle Fatigue Failure Of Metallic Beams Using Lamination, Riyah Kiter

Engineering and Technology Journal

Fatigue analysis helps in predicting life of the component and seeks improvements of the whole process in design phase. Efforts are continually made to combat the fatigue phenomenon, yet certain mechanical components are still failing due to fatigue. The present work proposes a laminated design of beams, which undergo fatigue. The well-known Paris-Erdogan formula was used to theoretically predict fatigue life of the proposed design. The design was shown to enhance fatigue properties through laminating the cross section of the component; Barriers in front of a propagating crack is deliberately included by lamination. Spectacular levels of improvement in the fatigue …

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Developing A Branch And Bound Algorithm For Cell Formation And Group Scheduling, Amjad Abdulghafour, Dhulfiqar Dhayef Aug 2026

Developing A Branch And Bound Algorithm For Cell Formation And Group Scheduling, Amjad Abdulghafour, Dhulfiqar Dhayef

Engineering and Technology Journal

Scheduling models for groups of parts have become more widely used in the industrial companies because of intensification of competition among them to get optimization in the delivery orders, reduce costs and increase quality. “Production scheduling is a meaning of verify a best or close to best achievement time plan for performing job, Production scheduling linked with the group technology applications is called Group Scheduling (GS). The objective of this research is to find optimum sequence of parts through cell formation and group scheduling. In this research, a lower bound for best possible Makespan is calculated by branch and bound …

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Investigation Of Microstructure And Chemical Analysis Along Weldments Aisi 410 Mss/Er Nicrmo-3, Emad Al-Hassani Aug 2026

Investigation Of Microstructure And Chemical Analysis Along Weldments Aisi 410 Mss/Er Nicrmo-3, Emad Al-Hassani

Engineering and Technology Journal

In this research work the weldability of AISI 410 martensitic stainless steels (SS) LP-blades of steam turbine joined by GTAW (gas tungsten arc welding); inconel-3 filler wire was investigated. To study the mechanical performance and microstructural characteristics of the welded joint, the optical-microscopic and micro-hardness were applied along the cross-section of specimens, respectively. Line/Point and EDS technique were used to predict the chemical composition of welding joint. WDS MAP/ WDS LINK (Energy Dispersive Spectroscopy) used to know the movement of elements along the weldments. Results showed that micro-hardness along the HAZ regions increased. Microstructure photographs revealed γ-austenite as predominate phase …

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Beneficiation Of Low Grade Calcium Bentonite Claystone, Hijran Toama, Abdul-Wahab Al-Ajeel, Ekhlas Abdullah Aug 2026

Beneficiation Of Low Grade Calcium Bentonite Claystone, Hijran Toama, Abdul-Wahab Al-Ajeel, Ekhlas Abdullah

Engineering and Technology Journal

The beneficiation of Ca-bentonite claystone has been studied with dispersion sedimentation technique using polyionic salts as dispersant.The claystone is located in the Western Desert of Iraq. It is of a low grade, associated with different amount of clay and non-clay mineral impurities. Calcite (CaCO3) constitutes the major proportion of these impurities. Various parameters; solid concentration, dispersant amount (e.g. sodium tripolyphosphate, and tetrasodium pyrophosphate), conditioning time, and centrifugal sedimentation speed and time on the efficiency of the beneficiation process were investigated and followed through the measurement of CaO% and cation exchange capacity (CEC) values of the upgraded claystone concentrate. Centrifugal sedimentation …

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Stability Analysis Of An Earth Dam Using Geo-Slope Model Under Different Soil Conditions, Usama Mishal, Thair Khayyun Aug 2026

Stability Analysis Of An Earth Dam Using Geo-Slope Model Under Different Soil Conditions, Usama Mishal, Thair Khayyun

Engineering and Technology Journal

Numerical models are used to check the stability of earth dams and to simulate the effects of all the parameters, which affect its safety. The physical properties of the materials used in the construction of an earth dam are one of these important parameters. The finite element analysis software used for numerical modeling in this study is GeoStudio 2007(SEEP/W and SLOPE/W). The total number of finite elements used to simulate the standard model is 13508 (triangular elements with global size = 2m), while the total number of nodes is 6939. The selected case study is Al-Adhaim dam, which is an …

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