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Some Properties Of Sustainable Concrete With Rubber Waste Aggregate, Rafid Motloq, Wasan Khalil, Eethar Dawood Mar 2026

Some Properties Of Sustainable Concrete With Rubber Waste Aggregate, Rafid Motloq, Wasan Khalil, Eethar Dawood

Engineering and Technology Journal

The cumulative quantities of non-biodegradable solid tire waste, which are byproducts of transport vehicles, contribute to environmental pollution.. This study seeks to address this issue by investigating the impact of using this waste as a replacement for natural coarse and fine aggregate in varying ratios (10%, 15%, and 20% as coarse aggregate, and 5%, 10%, and 15% as fine aggregate by volume) to create sustainable concrete. All mixtures incorporate 10% silica fume (SF) as a cement replacement by weight. Results reveal decreased workability, fresh density, compressive, and splitting tensile strength with increasing rubber replacement proportions. However, utilizing tire rubber aggregate …

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Studying The Possibility Of Producing Paving Flags From Geopolymer Concrete Containing Local Wastes, Nazar Al- Obeidy, Wasan Khalil Mar 2026

Studying The Possibility Of Producing Paving Flags From Geopolymer Concrete Containing Local Wastes, Nazar Al- Obeidy, Wasan Khalil

Engineering and Technology Journal

Geopolymer concrete is an inorganic composite material created by interacting alkaline substances with an aluminosilicate source and aggregate. Precast building units are considered the most prominent uses of geopolymer concrete, and the utilization of recycled steel fibres and rubber from damaged tires that are non-biodegradable to reduce environmental pollution. The results of this investigation show the possibility of using geopolymer concrete with and without the inclusion of crumbed rubber and recycled steel fibers from damaged tires in the production of paving flags with dimensions of 400 × 200 × 50 mm class c according to IQS 1107. Four types of …

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Enhancing Pullout Load Performance Of Under-Reamed Piles In Homogeneous Layered Clay: A Numerical Comparative Study, Anji Al-Bayati, Mohammed Al-Neami, Falah Rahil Mar 2026

Enhancing Pullout Load Performance Of Under-Reamed Piles In Homogeneous Layered Clay: A Numerical Comparative Study, Anji Al-Bayati, Mohammed Al-Neami, Falah Rahil

Engineering and Technology Journal

A 3D numerical model generated using PLAXIS-3D software was used in the present research to predict the behavior of under-reamed piles under pullout loading conditions with presumed soil Mohr-Coulomb failure. The under-reamed pile was embedded in homogeneous, layered clay soil, with stiff clay overlain by soft clay and soft clay overlain by stiff clay. The piles were chosen per the Indian Code (IS 2911) specification, and two variables were studied: bulb provision and soil layering. Inhomogeneous clay with varying cohesion values (20, 40, and 80 kPa) and under the same conditions, the pullout capacity was improved compared to a straight …

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Studying Characteristics And Strength Of The Unsaturated Gypseous Soil With Various Saturation Degrees, Ahmed Abood, Mohammed Fattah, Aqeel Al-Adili Mar 2026

Studying Characteristics And Strength Of The Unsaturated Gypseous Soil With Various Saturation Degrees, Ahmed Abood, Mohammed Fattah, Aqeel Al-Adili

Engineering and Technology Journal

The main objective of this study is to determine the appropriateness of unsaturated gypseous soil as a subgrade layer for carrying foundations. A comprehensive laboratory testing program was implemented to investigate the geotechnical characteristics and behavior of unsaturated gypseous soil. Tests that are physical included specific gravity, classification tests, relative density, Proctor compactions, single and double oedometer collapse potential, and static triaxial compression (CU-test). Chemical testing, Scanning Electron Microscopy (SEM), and Electronic Dissipation x-ray Scanning (EDS) analyses were also carried out. The tests were performed for samples prepared at 70% relative density of the natural gypseous soil. Tests are performed …

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Free Vibration Of Thin Beams On Winkler Foundations Using Generalized Integral Transform Method, Charles Ike Mar 2026

Free Vibration Of Thin Beams On Winkler Foundations Using Generalized Integral Transform Method, Charles Ike

Engineering and Technology Journal

The determination of free vibration frequencies of thin beams on Winkler foundations is important in their design to avoid resonant failures when the excitation frequency equals the least natural frequency. This article presents the determination of natural transverse vibration frequencies of Euler-Bernoulli beams on Winkler foundations using the Generalized Integral Transform Method (GITM). The problem is governed by a fourth-order partial differential equation (PDE) and boundary conditions dependent on the end restraints. The governing PDE is transformed into an algebraic eigenvalue problem for harmonic vibrations and harmonic response. Analytical solutions of the governing equations are difficult and complex. Hence, other …

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Elzaki Transform Method For Natural Frequency Analysis Of Euler-Bernoulli Beams, Charles Ike, Tarig Elzaki Mar 2026

Elzaki Transform Method For Natural Frequency Analysis Of Euler-Bernoulli Beams, Charles Ike, Tarig Elzaki

Engineering and Technology Journal

Free vibration analysis of thin beams under dynamic excitation is important in design to prevent resonance failures that occur when the excitation frequency coincides with the natural vibration frequency. In this paper, the Elzaki transform method (ETM) is used, for the first time, to solve the free vibration problem of thin beams. The beam is assumed to be homogeneous and prismatic, and the vibration is assumed to be harmonic. As a result, the field equation becomes a fourth-order homogeneous ordinary differential equation (ODE). The Elzaki transform method is chosen in this study due to its proven ability to solve ODEs, …

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Cold-Bonded Lightweight Synthetic Aggregate Involving High Reactive Attapulgite At Different Curing Conditions, Mohammed Abbas, Waleed Abbas Mar 2026

Cold-Bonded Lightweight Synthetic Aggregate Involving High Reactive Attapulgite At Different Curing Conditions, Mohammed Abbas, Waleed Abbas

Engineering and Technology Journal

This study aimed to develop an eco-friendly, lightweight, and synthetic aggregate (SLA) based on clay suitable for use in structural lightweight concrete. The researchers utilized the cold-bonded pelletization process to agglomerate pozzolanic materials, specifically attapulgite extracted from a quarry, and crushed into a fine filler. The appropriate calcination temperature for manufacturing this clay as a pozzolanic material is 750°C. A total of 22 mixes were created using a combination of high reactive attapulgite (HRA) and cement (PC), with the attapulgite replacement rate varying from 100-50% by a 10% decrement. Different types of curing methods, including oven-dry, oven-water, room-water, and room-room, …

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Effect Of Bridge Piers Locations And Flow Intensity On Morphological Change In A 180-Degree River Bend, Abdurazaq Abdulwahd, Jaafar Maatooq Mar 2026

Effect Of Bridge Piers Locations And Flow Intensity On Morphological Change In A 180-Degree River Bend, Abdurazaq Abdulwahd, Jaafar Maatooq

Engineering and Technology Journal

Bridges when it crossing rivers often required multiple piers for support. One of has a limited investigation is the impact of piers on scouring and morphological aspects when a bridge crossing sharp-bend of river. Consequently, it is crucial to investigate the hydraulic behavior of water flow in these areas due to the presence of these piers. In present study, an experimental program was conducted on a laboratory flume featuring a two-pier bridge within a 180-degree (sharp) bend to accomplish this. The piers were strategically positioned at 90 and 150 degrees within the bend. The results indicated that the bridge within …

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A Comparative Study Of Antibacterial Activity Of Zno And Tio2 Nanoparticles Against Gram-Positive And Gram-Negative Bacteria, Ghaed Salman Mar 2026

A Comparative Study Of Antibacterial Activity Of Zno And Tio2 Nanoparticles Against Gram-Positive And Gram-Negative Bacteria, Ghaed Salman

Engineering and Technology Journal

Using the sol-gel technique, this study successfully synthesized two types of nanoparticles, ZnO and TiO2. The Fourier-transform infrared (FTIR) spectrum exhibited a broad peak, providing insights into crucial chemical bonds. The average grain sizes, 18.6 nm for ZnO and 12.6 nm for TiO2 were determined through X-ray diffraction (XRD). Scanning electron microscopy (SEM) images of the (ZnO & TiO2) powder revealed the presence of pores and agglomeration. The antimicrobial efficacy of these nanoparticles was evaluated against Gram-negative bacteria (E. coli and Proteus) and Gram-positive bacteria (Staph. aureus). The results demonstrated the capability of both ZnO and TiO2 to impact bacterial …

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Review On The Physicl Properties Of Polyethylene Oxide, Fahad Kamal, Nahida Hameed, Evan Salim, Subash Gopinath Mar 2026

Review On The Physicl Properties Of Polyethylene Oxide, Fahad Kamal, Nahida Hameed, Evan Salim, Subash Gopinath

Engineering and Technology Journal

Solid polymeric electrolytes have become crucial today due to their stability and high conductivity. Recently, lithium ion-doped polymeric electrolytes have gained intense attention for their superior ability to create highly conductive electrolytes for batteries and energy storage. This innovative electrolyte type has displaced many traditional systems due to their flammability and bulkiness. Traditional liquid organic electrolytes pose risks due to their flammable and unstable nature. Solid-state composite electrolytes offer both mechanical stability and electrical conductivity by using solid polymeric matrices like polyethylene oxide and polyurethane reinforced with inert fillers like alumina and titanium dioxide. Polyethylene oxide (PEO)-based materials show promise …

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New S-Box Design For Image Encryption Based On Multi-Chaotic System, Azhaar Abdallah, Alaa Farhan Mar 2026

New S-Box Design For Image Encryption Based On Multi-Chaotic System, Azhaar Abdallah, Alaa Farhan

Engineering and Technology Journal

Image encryption is a crucial area for researchers in information security, which protects digital images from unauthorized access. This paper proposes a novel image encryption scheme based on the multi-chaotic system. This paper is about encrypting color images based on a 2D Henon map and a 3D Lorenz map. We used the 2D Henon map equation to generate a new S-Box, thus creating a solid cipher that is difficult to break (for the confusion operation). We then generate keys from the 3D Lorenz map for the shifting process (for diffusion operation). A comparative analysis and the simulation test show that …

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Physical And Electrical Properties Of Spray Coating Graphene Films: The Effect Of Solution Concentration, Ayat Yahya, Evan Salim, Azhar Hassan, Subash C. B. Gopinath Mar 2026

Physical And Electrical Properties Of Spray Coating Graphene Films: The Effect Of Solution Concentration, Ayat Yahya, Evan Salim, Azhar Hassan, Subash C. B. Gopinath

Engineering and Technology Journal

Graphene nanofilms were deposited by the spray coating method at different concentrations (0.05, 0.1, 0.2, 0.3, 0.4, and 0.5 g) and prepared at 120°C. The prepared nanofilms were characterized in terms of their structural, morphological, optical, and electrical properties. The results confirm the formation of high-purity and high-crystallinity graphene nanofilms with a layered nanosheet morphology. The X-ray diffraction pattern shows the presence of pure graphene with (002) crystal planes. SEM Images show that the intended graphene films are symmetrical with few wrinkles on their surface. The graphene films show semi-transparent behavior with a maximum transmission of 50%. Raman spectroscopy shows …

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Heat Transfer Coefficients In Air-Solid Fluidized Bed Using Vertical Heating Element, Fadhil Faraj, Jamal Ali, Sarmad Najim Mar 2026

Heat Transfer Coefficients In Air-Solid Fluidized Bed Using Vertical Heating Element, Fadhil Faraj, Jamal Ali, Sarmad Najim

Engineering and Technology Journal

In various chemical industrial applications such as hydrocracking, drying, and Fischer-Tropsch, the utilization of fluidized bed systems is prevalent. Efficient heat transfer is crucial for maintaining stable temperatures and ensuring product quality in industrial processes. Gas-solid fluidized beds, which involve gas circulation through a bed of solid particles, offer a means to achieve efficient heat exchange. However, factors such as particle size, gas velocity, and heating methods can influence the effectiveness of these systems. To investigate the impact of internal heating on heat transfer in gas-solid fluidized beds, an experimental study was conducted using glass beads of 200 and 600 …

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Production Of High-Efficiency Alternative Biodiesel From Transesterification Of Waste Cooking Oil Using An In-House Made Y-Type Zeolite Catalyst, Huda Abdul-Kader, Zaidoon Shakor, Bashir Al-Zaidi, Shurooq Al-Humairi, Musa Salihu Mar 2026

Production Of High-Efficiency Alternative Biodiesel From Transesterification Of Waste Cooking Oil Using An In-House Made Y-Type Zeolite Catalyst, Huda Abdul-Kader, Zaidoon Shakor, Bashir Al-Zaidi, Shurooq Al-Humairi, Musa Salihu

Engineering and Technology Journal

Y-zeolite catalyst, with a Si/Al ratio of 2.23 and a high surface area of 703.34 m2/gcat, was prepared with three different particle sizes: 75, 600, and 1000 μm, from commercial Ludox AS-40 colloidal silica 40 wt.% suspension in water using the hydrothermal method. Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray (EDX), Atomic Force Microscopy (AFM), X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Brunauer-Emmett-Teller (BET) analyses were all utilized to analyze the properties of the synthesized Y-zeolite catalyst. Waste cooking oil (WCO) was transesterified to biodiesel in a batch reactor under different temperatures (e.g., 40, 50, and …

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Servo And Regulatory Response Of An Industrial Fluid Catalytic Cracking (Fcc) Unit Under Fuzzy Logic Supervisory Control, Princewill Josiah, Ipeghan Otaraku, Benson Evbuomwan Mar 2026

Servo And Regulatory Response Of An Industrial Fluid Catalytic Cracking (Fcc) Unit Under Fuzzy Logic Supervisory Control, Princewill Josiah, Ipeghan Otaraku, Benson Evbuomwan

Engineering and Technology Journal

A self-tuning hierarchical controller in which a Fuzzy logic controller supervises the control actions of a conventional PID has been proposed, implemented and presented in this paper. The controller has been applied to a control study of Fluid Catalytic Cracking unit (FCCU) riser temperature, and regenerator temperature respectively. Comparison between the performance of the proposed Fuzzy-PID controller and the conventional PID was made in simulation studies of regulatory and servo performances of the two controller types. Six performance measures: Percent overshoot (OS), settling time (ST), integral absolute error (IAE), integral square error (ISE), integral time absolute error (ITAE) and integral …

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Studying The Effect Of Phosphogypsum Addition On Ceramic Membrane Properties, Adel Zrelli, Elhem Metoui, Abdoulaye Doucouré Mar 2026

Studying The Effect Of Phosphogypsum Addition On Ceramic Membrane Properties, Adel Zrelli, Elhem Metoui, Abdoulaye Doucouré

Engineering and Technology Journal

This study aimed to investigate the effects of phosphogypsum addition on ceramic membrane properties. In this regard, clay and phosphogypsum were characterized using FTIR and laser particle sizer. The ceramic paste was prepared by incorporating varying amounts of phosphogypsum (10 to 50%), followed by molding using a semidry-pressing process at 10 bars pressure and sintering temperature at 900°C. The raw materials and prepared membranes were analyzed using FTIR, laser particle size, contact angle, porosity, and mechanical strength to evaluate the properties of the resulting ceramic membranes. The study showed that as the amount of phosphogypsum increased from 10% to 50%, …

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Speech Recognition Algorithm In A Noisy Environment Based On Power Normalized Cepstral Coefficient And Modified Weighted-Knn, Mohammed Safi, Eyad Abbas Mar 2026

Speech Recognition Algorithm In A Noisy Environment Based On Power Normalized Cepstral Coefficient And Modified Weighted-Knn, Mohammed Safi, Eyad Abbas

Engineering and Technology Journal

Speech recognition is widely used in robot control and automation. Nevertheless, the use of speech recognition in robots is limited due to its susceptibility to background noise. This paper proposes a speech recognition algorithm to control robots in noisy environments. The proposed algorithm is based on Perceptual Linear Predictive Cepstral Coefficients (PNCC), which is a noise-resistant feature extraction technique, and Modified K-Nearest Neighbors (KNN) with Dynamic Time Warping (DTW) as the classifier. A new KNN-DTW classifier is proposed, integrating weighted KNN and DTW. The proposed algorithm results from experiments comparing PNCC and Mel-frequency cepstral coefficients (MFCC) feature extraction techniques with …

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Investigation Of Fault Analysis For Renewable Energy Microgrid, Afaneen Abbood, Hanan Habbi, Mohamed Zohdy Mar 2026

Investigation Of Fault Analysis For Renewable Energy Microgrid, Afaneen Abbood, Hanan Habbi, Mohamed Zohdy

Engineering and Technology Journal

This paper investigates the behavior of four bus grid-connected systems during different types of faults. The microgrid comprises a utility grid, a solar PV energy system, a diesel generator, and a load. Symmetrical and unsymmetrical faults at the microgrid distribution network were studied. These faults were applied at the solar PV bus under constant irradiance and temperature. The active and reactive power from the solar PV was synchronized based on the maximum power point tracking (MPPT) solar inverter. The total harmonic distortion (THD) for the load current response was also measured for each symmetrical and unsymmetrical fault. A protection system …

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Implementation Of Hyperbolic Sine And Cosine Functions Based On Fpga Using Different Approaches, Rawasee Yousif, Ivan Hashim, Bassam Abd Mar 2026

Implementation Of Hyperbolic Sine And Cosine Functions Based On Fpga Using Different Approaches, Rawasee Yousif, Ivan Hashim, Bassam Abd

Engineering and Technology Journal

This paper presents the implementations of the hyperbolic sine and cosine functions, which are essential in many digital systems. In the previous eras, these functions were only implemented in software; however, hardware implementations have recently become more significant due to the performance advantages of hardware systems over software implementations. Therefore, these functions can be hardware implemented using various methods such as the CORDIC algorithm, Taylor series, polynomial approximation technique, and LUT approach. This paper focuses on reducing area utilization (logic components), low latency, and reducing power consumption. Five designs are proposed based on different techniques, in which the ROM approach …

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Performance Analysis Of Underwater Optical Communication System In Turbulent Link, Murtadha Joudha, Jassim Hmood, Salah Adnan Mar 2026

Performance Analysis Of Underwater Optical Communication System In Turbulent Link, Murtadha Joudha, Jassim Hmood, Salah Adnan

Engineering and Technology Journal

Underwater wireless optical communication (UWOC) systems have been identified as a suitable replacement technology with high data rates over relatively medium transmission ranges for underwater communication. In the research, we propose a new optical hybrid modulation format for carrying the letters over underwater wireless optical communication (UWOC) system. This hybrid modulation format combines pulse position modulation (PPM) with digital pulse interval modulation (DPIM) to increase the transporting speed. The proposed UWOC system is experimentally investigated in the laboratory over a clean and turbulent water channel. The message was electrically modulated in the transmitter with PPM-DPIM format and then applied to …

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Image Processing Evaluation Of Lsp Effect On The Corrosion Rate For The 304 Alloy, Raghad Salman, Razi Al-Azawi, A. Kadhim Mar 2026

Image Processing Evaluation Of Lsp Effect On The Corrosion Rate For The 304 Alloy, Raghad Salman, Razi Al-Azawi, A. Kadhim

Engineering and Technology Journal

The purpose of the study is to inhibit the corrosion rate using the (LSP) laser shock processing technology with an ND-YAG laser utilizing the Q-switched technique with a wavelength of 1046 nm for stainless steel 304 alloy. Laser shock processing (LSP) is a novel surface treatment approach for strengthening metal materials that use a high peak power, a brief pulse, and cold hardening. The laser parameters’ effect includes laser pulse energy and pulse repetition rate on the surface properties. The qualities of sample surfaces were investigated, including surface roughness and micro-hardness. The X-ray fluorescence technique was used to analyze the …

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The Energy-Efficient Control Solutions Of Smart Street Lighting Systems: A Review, Issues, And Recommendations, Tarek Abedin, Chong Tak Yaw, Siaw Paw Koh, M.A. Hannan, Sieh Kiong Tiong, Kok Hen Chong, Ahmed N Abdalla, Kharudin Ali Mar 2026

The Energy-Efficient Control Solutions Of Smart Street Lighting Systems: A Review, Issues, And Recommendations, Tarek Abedin, Chong Tak Yaw, Siaw Paw Koh, M.A. Hannan, Sieh Kiong Tiong, Kok Hen Chong, Ahmed N Abdalla, Kharudin Ali

Engineering and Technology Journal

The smart street-lighting system (SSLS) is a leading candidate in the smart city. By the time of the last 15 cycles, many meaningful improvements have been executed in the SSLS with the impact of the internet of things technologies and universal networking devices. Conventional smart street lighting systems are restricted to wireless sensor networks, mobile devices, and old lighting control systems. This article presents a comprehensive treatment of network designs, namely communication, control, and wireless sensor-based smart street lighting system by deploying based on their existing system architecture, and network topologies including leading with it a host of privileges. In …

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Comparative Study Of Induction Motor And Steam Turbine At Kebon Agung Sugar Factory Malang Indonesia, Roro Hendaryati, Sudarman Sudarman, Damario Baskoro, Nyoto Susilo, Cucut Pamungkas, Willy Nugroho, Yepy Sofi'i Mar 2026

Comparative Study Of Induction Motor And Steam Turbine At Kebon Agung Sugar Factory Malang Indonesia, Roro Hendaryati, Sudarman Sudarman, Damario Baskoro, Nyoto Susilo, Cucut Pamungkas, Willy Nugroho, Yepy Sofi'i

Engineering and Technology Journal

Induction motors and steam turbines are the main components in the sugar cane milling process. This study analyzes the efficiency of induction motors and steam turbines as mill drives at the Kebon Agung Sugar Factory in Malang, Indonesia. This study used experimental methods by observing and testing at the Kebon Agung Sugar Factory. The induction motors analyzed were mills 1, 2, and 5. Meanwhile, the steam turbines analyzed were cane cutter 1, 2, heavy-duty hammer shredder, mill 3, and mill 4. Motor and turbine data were obtained through the control system. Furthermore, the motor and turbine data are processed, and …

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Analytical Study Of Free Vibration Characteristics For Sandwich Cylindrical Shell With Single Phase Metal Core, Ahmed Mouthanna, Sadeq Bakhy, Muhannad Al-Waily Mar 2026

Analytical Study Of Free Vibration Characteristics For Sandwich Cylindrical Shell With Single Phase Metal Core, Ahmed Mouthanna, Sadeq Bakhy, Muhannad Al-Waily

Engineering and Technology Journal

This paper presents an analytical investigation of the nonlinear vibration characteristics of a single-phase functionally graded cylindrical shell panel with various porous metal cores. Porous constructions with varying degrees of porosity throughout their volume are known as functionally graded materials (FGMs). These materials have a wide range of applications across several industries, including shipbuilding, automotive, biomedical, marine, and aerospace. The sandwich cylindrical panel has a porous metal core, while the top and bottom faces are composed of homogeneous materials. The model is improved using a power-law function. The governing equations of motion are discretized according to the classical thin shell …

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Exploring The Effects Of A New Lifter Design And Ball Mill Speed On Grinding Performance And Particle Behaviour: A Comparative Analysis, Ali Safa, Sahraoui Aissat Mar 2026

Exploring The Effects Of A New Lifter Design And Ball Mill Speed On Grinding Performance And Particle Behaviour: A Comparative Analysis, Ali Safa, Sahraoui Aissat

Engineering and Technology Journal

Ball mills are the leading grinding equipment in the mineral processing industry. Balls are the primary component in the grinding of materials. Lifters lift these balls to the shoulder position before cataracts them to the toe position. Almost all classical theories do not consider the lifter's geometry in calculating the energy consumption of ball mills and focus only on the fill level of the charge, the lifter dimensions, their number, and the mill's rotational speed. To improve the ball mill's performance, a new shape of the lifters was proposed in the present research work. Simulation through the EDEM software and …

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Impact Of Cooling Fluid Temperature On The Structural Integrity Of Gas Turbine Stator Blades, Olumide Towoju Mar 2026

Impact Of Cooling Fluid Temperature On The Structural Integrity Of Gas Turbine Stator Blades, Olumide Towoju

Engineering and Technology Journal

The importance of gas turbine engines to the aviation industry cannot be overemphasized. Being a major part of aircrafts and jets, its reliability must be second to none. They are continuously subjected to extreme conditions during service making them the subject of constant studies. To produce the thrust and torque power required of them, they have to convert the intense heat and pressure inherent in hot combustion gases. To withstand the high combustion gas temperature without thermal failure, specialized materials and cooling are employed. This study numerically investigated the effect of cooling fluid temperature on the structural integrity of a …

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Performance Evaluation Of Pv Panel Powered Dual Thermoelectric Air Conditioning System, Mustafa Salman, Mahmoud Mahdi, Majida Ahmed Mar 2026

Performance Evaluation Of Pv Panel Powered Dual Thermoelectric Air Conditioning System, Mustafa Salman, Mahmoud Mahdi, Majida Ahmed

Engineering and Technology Journal

Thermoelectric air condition system (TEACs) powered by solar photovoltaics is useful for thermal comfort applications, especially when there is a direct energy source like sunlight. This paper presents experimental investigations of solar-powered thermoelectric air conditioning for both cooling and heating modes. The experiments were carried out in a test room whose volume is 1 m3 under the climatic conditions of the city of Baghdad. In the summer, the thermoelectric device functions as a Peltier cooler. The cold side absorbs the heat from the inside to lower the room's temperature. As for winter, the heat is released from the thermoelectric Peltier …

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The Effect Of Electrode Geometry And Pre-Heating Treatment On Resistance Spot Welding Strength, Lana Hassan, Hameed Lafta Mar 2026

The Effect Of Electrode Geometry And Pre-Heating Treatment On Resistance Spot Welding Strength, Lana Hassan, Hameed Lafta

Engineering and Technology Journal

Resistance spot welding (RSW) is one of the most significant and common metal joining methods used in industries. The present paper discusses the comparative performance of resistance spot welding electrodes of nontraditional design with the traditional one of 8 mm contact diameter in welding a 1.5 mm thick low carbon steel sheet used in automobile structural bodies and bridges. The modified electrode tip surface center was machined to have three different holes of 2, 3, and 4 mm depth and three different diameters of 2, 4, and 6 mm producing nine different hollow electrode dimensions. As well as the influence …

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Mathematical Model Of Properties And Experimental Fatigue Investigation At Elevated Temperatures Of Functionally Gradient Materials, Ziadoon M.R Al-Hadrayi, Ahmed Al-Khazraji, Ahmed Shandookh Mar 2026

Mathematical Model Of Properties And Experimental Fatigue Investigation At Elevated Temperatures Of Functionally Gradient Materials, Ziadoon M.R Al-Hadrayi, Ahmed Al-Khazraji, Ahmed Shandookh

Engineering and Technology Journal

Fatigue that occurs at elevated temperatures is called thermal fatigue. High temperatures and cycling loads cause thermal fatigue that can cause component failures. In this paper, induced the mathematical models for functionally gradient materials and three models of functionally gradient materials (FGMs) manufactured by permanent casting were tested to predict their thermal fatigue life. FGMs have been tested to determine the effect of fatigue and temperature interactions. FGMs models were of FGM1, FGM2, and FGM3  respectively, with the following volume fractions and gradations: [100%Al-50%Al50%Zn-50%Zn50%Al-100%Zn], [100%Al-30%Zn70%Al-70%Zn30%Al-100%Zn] and [100%Al-70%Zn30%Al-30%Zn70%Al-100%Zn]. The experimental procedure presented the mechanical properties as modulus of elasticity at two …

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Effect Of Ecap Process On Mechanical Properties And Microstructure Of Aa-6061 Recycled Chips, Rawa Mohammed, Ayad Shahab, Alireza Rezaei Mar 2026

Effect Of Ecap Process On Mechanical Properties And Microstructure Of Aa-6061 Recycled Chips, Rawa Mohammed, Ayad Shahab, Alireza Rezaei

Engineering and Technology Journal

The oxidation of aluminum machined chips makes successful recycling via the traditional re-melting technique difficult. A viable solution to this problem is to utilize solid-state recycling to transform aluminum machined chips directly into semi-finished goods, eliminating the costs of the re-melting process and minimizing CO2 emissions. In the present study, Al-6061 alloy chips have been recycled using hot extrusion followed by severe plastic deformation at ambient temperature to examine the material's mechanical properties and microstructures. The current study investigates the effects of equal channel angular pressing samples after (1, 2, and 4) cycles using a die with  90° and  20° …

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