Effect Of Argon Gas Flow Rate On Crystal Structure, Morphology, And Optical Properties Of Cigs Film For Photodetector Applications,
2025
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Malang 65145, Indonesia
Effect Of Argon Gas Flow Rate On Crystal Structure, Morphology, And Optical Properties Of Cigs Film For Photodetector Applications, Nurul Lathi’I Fatul Chamidah, Fadilah Wulan Cahyani, I Gusti Ayu Isnaini Fatha Ramadhani, Erma Surya Yuliana, Nasikhudin Nasikhudin, Safwan Abd. Aziz, Nandang Mufti
Journal of Mechanical Engineering Science and Technology (JMEST)
CIGS material can be used as a material for photodetector applications. The deposition of CIGS thin films remains challenging. Generally, argon is used as a gas to bombard the CIGS material through the sputtering method. This study fabricated photodetectors by varying the argon gas flow rate (50-80 sccm) to investigate its effect on device performance. XRD, SEM, UV-Vis, and photoresponse tests were characterized. Structural analysis using XRD showed a weak (112) diffraction peak, indicating that the resulting film was not fully crystalline, but rather consisted of a nanocrystalline phase, even partly amorphous, with small crystallite sizes. According to the SEM …
Impact Of Cpo And B35 On Diesel Engine Rocker Arm Wear During Long-Term Operation,
2025
Mechanical Engineering, Faculty of Engineering, UPN Veteran Jawa Timur, Surabaya, 60294
Impact Of Cpo And B35 On Diesel Engine Rocker Arm Wear During Long-Term Operation, Fawwaz Aqilah Nurmansyah, Nur Fadilah Rizky Supramono, Muhammad Ikhsan, Erwan Adi Saputro, Wiliandi Saputro
Journal of Mechanical Engineering Science and Technology (JMEST)
The increasing number of motor vehicles has led to higher fossil fuel consumption, contributing to greenhouse gas emissions, climate change, and environmental degradation. As a renewable alternative, biodiesel offers a way to reduce these impacts. Indonesia, with its abundant natural resources, has significant potential for biodiesel production. Crude palm oil (CPO) is a promising feedstock due to its availability and relatively low environmental impact. However, the high costs associated with the transesterification process make direct use of pre-heated CPO an area worth exploring. This study investigates the impact of pre-heated pure CPO compared to B35 ("Dexlite") on rocker arm wear …
Optimizing Zeolite Catalysts For Efficient Ldpe Plastic Waste Pyrolysis,
2025
Mechanical Engineering, Jambi Polytechnic, Alam Barajo, Jambi, 36361, Indonesia
Optimizing Zeolite Catalysts For Efficient Ldpe Plastic Waste Pyrolysis, Hilda Porawati, Mazwan Mazwan, Sukadi Sukadi
Journal of Mechanical Engineering Science and Technology (JMEST)
The problem of plastic waste, particularly from low-density polyethylene (LDPE) plastic bags, poses a significant challenge in environmental management due to its non-biodegradable nature and widespread use in daily life. This study evaluates the influence of catalyst types on the characteristics and energy efficiency of liquid fuel products produced from LDPE waste pyrolysis. The three treatments compared were no catalysts, natural zeolite catalyst, and synthetic zeolite catalysts, each subjected to three different temperature variations: 250°C, 300°C, and 350°C. The observed parameters in this study were volume, product mass, cetane index, density, sulfur content, viscosity, flash point, calorific value, and energy …
One-Way Thermal-Fluid-Solid Coupling Analysis Of Helicopter Tail Reducer With Spiral Bevel Gear,
2025
College of Mechanical Engineering, Changzhou Institute of Technology, Changzhou, 213032, China
One-Way Thermal-Fluid-Solid Coupling Analysis Of Helicopter Tail Reducer With Spiral Bevel Gear, Dongping Sheng, Zhongyuan Ma, Chenqi Zhou, Haidong Feng, Hun Guo, Chun Su
Journal of Mechanical Engineering Science and Technology (JMEST)
This research focuses on investigating the thermal-fluid-solid coupling behavior within spiral bevel gears to enhance the bearing capacity and extend the operational service life of the gear reducer located in the helicopter tail gearbox. The study commences by constructing detailed, parametrically defined threedimensional digital models. These models accurately represent the critical components: the spiral bevel gear itself, the surrounding gearbox housing, and the supporting gear shaft, based directly on the specifications of an actual helicopter tail reducer assembly. Subsequently, the analysis proceeds with a one-way, steadystate thermal-solid coupling simulation performed on the established model assembly. This critical simulation phase aims …
Thermophysical, Rheological And Wear Resistance Of Canola Oil Biolubricant With Calcium Carbonate Additive Nanoparticle As Coolant In Cnc Machining,
2025
Department of Mechanical and Industrial Engineering, Universitas Negeri Malang, Indonesia
Thermophysical, Rheological And Wear Resistance Of Canola Oil Biolubricant With Calcium Carbonate Additive Nanoparticle As Coolant In Cnc Machining, Alfandi Jaelani, Poppy Puspitasari, Diki Dwi Pramono, Alief Muhammad, Muhammad Kozin, Muhammad Kashif
Journal of Mechanical Engineering Science and Technology (JMEST)
Vegetable oil-based cutting fluids are of great importance in supporting green and sustainable manufacturing. This research introduces a new groundbreaking vegetable lubricant formulated with canola oil as the base material, coupled with CaCO3 nanoparticles synthesized from scallop shell waste and used as a cutting fluid in the AISI 1045 CNC machining process steel sprayed with minimum quantity lubrication (MQL). This investigation delves into the thermophysical, rheological, and wear resistance of the developed bio-lubricant. The results of this analysis show density value increased in the canola + CaCO3 0.15% sample by 3.28% of the pure canola sample, as did the viscosity …
Improvement Of Thermal Energy Storage Performance In Al-Al2o3 Composites Through Additions Of Copper: Evaluation Of Microstructure And Thermal Properties,
2025
Department of Mechanical Engineering, Tadulako University, Soekarno Hatta Street, Palu, 94119, Indonesia
Improvement Of Thermal Energy Storage Performance In Al-Al2o3 Composites Through Additions Of Copper: Evaluation Of Microstructure And Thermal Properties, Muhammad Hasan Basri, Ramang Magga, Muhammad Syaiful Fadly, Zikri Arifansyah Djaba, Muhammad Iqbal Ibrahim, Hidayat Hidayat, Yandi Yandi
Journal of Mechanical Engineering Science and Technology (JMEST)
The study aims to evaluate the influence of adding copper aluminum–alumina composite (Al–Al₂O₃) against characteristic thermal properties through metallurgical powder. Three variations of the composition of weight copper were used, namely 5%, 10%, and 15%, with aluminum as the matrix and alumina as the reinforcement. Thermal test covering analysis of thermal conductivity, specific heat, and microstructure characterization using SEM-EDX. The results show that adding Cu increases thermal conductivity significantly, with the highest mark achieved in the 15% Cu composite (6.47 W/m.°C). However, the increase in Cu content above 10% causes the agglomeration of particles and enhancements in porosity, which harms …
Simulation Of Stress, Deformation, And Vibration In Unlubricated Ball Bearings At Varying Rotational Speeds,
2025
Department of Mechanical Engineering, Malang State Polytechnic
Simulation Of Stress, Deformation, And Vibration In Unlubricated Ball Bearings At Varying Rotational Speeds, Billy Dwiki, Moh. Hartono
Journal of Mechanical Engineering Science and Technology (JMEST)
Bearings are critical components in rotating machinery, and their performance is highly influenced by operational factors such as rotational speed, load, and lubrication. This study aims to analyze the deformation, stress, and dynamic behavior of SAE 52100 bearings under dry operating conditions at various rotational speeds, as well as to propose mitigation strategies for high-speed industrial applications. A finite element simulation was conducted using ANSYS R19.2 to evaluate the total deformation, equivalent elastic strain, Von Mises stress, and vibrational characteristics of a 6204-type SAE 52100 bearing. The simulations were performed across a speed range of 600 to 2000 RPM under …
Numerical Investigation Of Ethanol-Enriched Diesel And Biodiesel Fuels In A Diesel Engine,
2025
Mechanical Engineering Department, Universitas Trisakti, Jl. Kyai Tapa No.1, Grogol, Jakarta,11440, Indonesia
Numerical Investigation Of Ethanol-Enriched Diesel And Biodiesel Fuels In A Diesel Engine, Annisa Bhikuning, Hezron Elyakim Potto, Sandi Apriandi Setiawan, Jamal F. Jati
Journal of Mechanical Engineering Science and Technology (JMEST)
This study explores the effects of ethanol blending on the performance and emissions of a compression ignition (CI) engine using both diesel and biodiesel as base fuels. Motivated by increasing environmental concerns regarding pollutant emissions from conventional diesel engines, ethanol was introduced as an oxygenated additive to improve combustion characteristics and reduce the formation of harmful exhaust emissions. Ethanol’s high oxygen content promotes more complete combustion, potentially lowering carbon-based emissions such as carbon monoxide (CO), particulate matter (PM), and unburned hydrocarbons. In this study, performance and emission parameters were simulated using Diesel-RK software at various engine speeds of 1500, 2000, …
The Effect Of Preheater On Heat And Mass Transfer Efficiency Using Rotating Drum Roaster,
2025
Department of Mechanical and Industrial Engineering, Universitas Negeri Malang, Jl Semarang 5, Malang, 65145, Indonesia
The Effect Of Preheater On Heat And Mass Transfer Efficiency Using Rotating Drum Roaster, Melisa Surya Andini, Retno Wulandari, Heru Suryanto
Journal of Mechanical Engineering Science and Technology (JMEST)
Indonesia is the third-largest coffee producer globally, facing challenges including rising raw material costs, increased energy consumption, and unpredictable weather conditions. One potential solution is optimizing energy efficiency during roasting. This study investigates the effect of preheating on time and energy efficiency in heat and mass transfer by utilizing waste heat to preheat green Robusta coffee beans. The experiment was conducted on a laboratory scale using a rotating drum roaster with a double-layer drum made of stainless steel and clay, at 200 °C under atmospheric pressure. Two treatments were applied: roasting with a preheater and without, each repeated three times …
Spray Angle On The Performance Of Split-Type Ac Condenser Installed On Concrete Rooftop In Tropical Climate,
2025
Department of Mechanical Engineering, Tadulako University, Jl. Soekarno Hatta Km.9, Palu, 94118, Indonesia
Spray Angle On The Performance Of Split-Type Ac Condenser Installed On Concrete Rooftop In Tropical Climate, Kennedy Kennedy, I N Frenki Aryana, Basri Basri
Journal of Mechanical Engineering Science and Technology (JMEST)
This study investigated the influence of different water spray angles (0°, 15°, and 30°) on the thermal and energy performance of a split-type air-conditioning (AC) condenser installed on a concrete rooftop in a tropical climate. An experimental setup was designed to replicate actual concrete rooftop conditions, focusing on the condenser inlet temperature, compressor power consumption, and system coefficient of performance (COP). A 6-minute ON and 6-minute OFF intermittent spray cycle was employed to optimise water usage and minimise excessive humidity. Experimental measurements were conducted on a 9,000 Btu/h split-type unit equipped with a nozzle system connected to a 200 L …
Numerical Analysis Of The Effect Of Vortex Generator On The Aerodynamic Performance Of Naca 6412 Airfoils Using Large Eddy Simulation,
2025
Mechanical Engineering, Adisutjipto Institute of Aerospace Technology, Jl. Janti / Jl. Majapahit Blok-R Yogyakarta 55198, Indonesia
Numerical Analysis Of The Effect Of Vortex Generator On The Aerodynamic Performance Of Naca 6412 Airfoils Using Large Eddy Simulation, Dedet Hermawan Setiabudi, Joan Bayuaji Nugroho, Eli Kumolosari, Lazuardy Rahendra Pinandhita, Okto Dinaryanto
Journal of Mechanical Engineering Science and Technology (JMEST)
Aerodynamic performance of an airfoil is significantly affected by flow separation, especially at high angles of attack. One common strategy to control flow separation is adding a triangular vortex generator (VG), which creates small vortices that help keep the airflow attached. The present study investigated the impact of triangular vortex generators on a NACA 6412 airfoil using Computational Fluid Dynamics (CFD) method. Large Eddy Simulation (LES) was applied due to its ability to show the vortices more clearly than other methods. It can also accurately capture the flow separation. To obtain the lift, drag, and lift-to-drag ratio (CL/CD) data, four …
Surface Modification Of Local Natural Fibers Via Alkali Treatment For Improved Mechanical And Molecular Properties Of Bamboo Fiber, Pineapple Leaf Fiber, And Sisal Fiber,
2025
Department of Manufacturing Engineering Technology, Universitas Negeri Malang, Semarang Street No. 5,
Malang, East Java, 65145, Indonesia
Surface Modification Of Local Natural Fibers Via Alkali Treatment For Improved Mechanical And Molecular Properties Of Bamboo Fiber, Pineapple Leaf Fiber, And Sisal Fiber, Jibril Maulana, Muhammad Ilman Nur Sasongko, Dewi Izzatus Tsamroh, Muchammad Yafis, Syekhan Maulana
Journal of Mechanical Engineering Science and Technology (JMEST)
A major development in materials science toward reinforcement materials in biopolymer composites has been caused by a worldwide trend toward sustainable manufacturing and the rise of the circular economy. However, their mechanical properties can often be affected by their hydrophilic properties, lack of surface compatibility, and their presence of molecular bonding, such as lignin and hemicellulose. Alkaline surface modification has been widely reported as an effective technique to increase structural stability and fibermatrix adhesion. This study evaluated the effects of alkalizing three types of local natural fibers—bamboo fiber (BF), pineapple leaf fiber (PALF), and sisal (SF)—with sodium hydroxide (NaOH) at …
Ai-Driven Innovations For Sustainable Healthcare Architecture In Developing Countries And Remote Areas: Enhancing Efficiency Through Futuristic Design,
2025
Assistant Professor of Architecture, Faculty of Engineering, Mansoura University, Egypt
Ai-Driven Innovations For Sustainable Healthcare Architecture In Developing Countries And Remote Areas: Enhancing Efficiency Through Futuristic Design, Esraa Elazab, Ahmed Eltawil
HBRC Journal
Access to healthcare in developing countries and remote areas remains a critical challenge due to geographic isolation, inadequate infrastructure, and limited medical resources. Communities in these regions face significant barriers in obtaining timely and adequate healthcare services, exacerbating public health issues. In response, artificial intelligence (AI) has emerged as a transformative technology, offering solutions that enhance healthcare systems by optimizing operational workflows, reducing human error, and improving resource management. When combined with sustainable design principles, AI-driven innovations provide a comprehensive approach to healthcare access and environmental sustainability. This paper presents a conceptual design proposal for a futuristic healthcare station aimed …
Best Practice Guidelines For Drafting Arbitration Clauses In Construction Contracts,
2025
Associate Professor of Construction Management, Faculty of Engineering at Shoubra, Benha University, Cairo, Egypt
Best Practice Guidelines For Drafting Arbitration Clauses In Construction Contracts, Mohamed Abdel-Monem, Haitham Amer, Karim El Dash
HBRC Journal
Arbitration is a widely recognized method for resolving construction disputes, relying on the parties' mutual agreement and the enforceability of well-drafted clauses. This study examines the key elements that contribute to the effectiveness and validity of arbitration clauses in construction contracts. The aim is to provide practical drafting guidelines and a validated practitioner checklist. The research combined a comprehensive literature review, expert interviews, a pilot and final questionnaire survey involving 49 legal and engineering professionals, and real-world case study analyses. Data validation and thematic analysis were used to identify critical factors influencing the clarity, enforceability, and efficiency of arbitration clauses. …
Cycling Network Planning Through Urban Form Analysis: A Contextual Gis Model,
2025
Architecture and Housing Research Institute, Housing and Building National Research Center (HBRC), Giza 11511, Egypt
Cycling Network Planning Through Urban Form Analysis: A Contextual Gis Model, Nora Osama Ahmed, Rania Adham Sayed, Mona Mahrous Abdel Wahed
HBRC Journal
Promoting cycling as a sustainable mode of urban mobility requires a deep understanding of how urban form influences cyclists’ route choices. This study investigates the influence of urban form on cyclists’ route selection in an attempt to enhance context-sensitive cycling network planning. Five factors of urban form density, transportation infrastructure, housing/building type, land use, and street layout are examined to determine if any of them have a contributing factor to route selection. Based on an extensive review of the literature, the research develops an Urban Form–Cyclist Route Priority Matrix (UF-CRP Matrix) that categorizes urban conditions into three levels of desirability …
Performance Evaluation Of Sustainable Hot Mix Asphalt Using Construction Waste Materials,
2025
Department of Civil Engineering, Faculty of Engineering, Menoufia University, Egypt
Performance Evaluation Of Sustainable Hot Mix Asphalt Using Construction Waste Materials, Mohamed A. Zaid, Ahmed E. Abu El-Maaty, Mohamed S. Ouf
HBRC Journal
This study aims to enhance sustainability, reduce environmental impact, minimize rutting, and improve performance by evaluating the use of construction material wastes. Ceramic waste powder (CWP), brick waste powder (BWP), and glass waste powder (GWP) were used as alternative fillers to conventional dolomite powder (DP) in hot-mix asphalt (HMA). The research investigates the effectiveness of these waste materials in improving asphalt performance, with the filler percentage fully replaced by these alternatives. Marshall Stability (MS), Marshall Quotient (MQ), moisture susceptibility, indirect tensile strength (IDT), and wheel tracking tests (WTT) were conducted to evaluate the impact of these waste materials on asphalt …
Eco Friendly Synthesis Of Copper Oxide Nanoparticles From Orange Peel Extract And Its Antimicrobial Studies,
2025
Housing and Building National Research Center, Cairo, Egypt
Eco Friendly Synthesis Of Copper Oxide Nanoparticles From Orange Peel Extract And Its Antimicrobial Studies, Rehab G. Hassan, Marwa M. El-Tyieb, N.Y Mohamed
HBRC Journal
The synthesis and stabilization of CuONPs at room temperature by using an aqueous extract of orange peel are described. The reason for the appearance of UV-vis absorption spectra peak at (∼439 nm) may be given as the evidence for forming CuONPs. In general, the XRD spectrum of the CuONPs agrees with the previous studies for Cu metal. Transmission Electron Microscopy exhibits irregular crystalline particles. Thus, the average particle size is ∼17 nm. CuONPs have shown potent bactericidal activities. The prepared CuONPs were applied against four pathogenic bacterial strains and three fungal strains as an antimicrobial agent. The inhibition growth zone …
Curved Mechanically Stabilized Earth Walls (Msews) Behavior From Field Measurements And Numerical Analysis,
2025
Associate Professor of Soil Mechanics and Foundation Engineering, Construction Research Institute, NWRC, Egypt
Curved Mechanically Stabilized Earth Walls (Msews) Behavior From Field Measurements And Numerical Analysis, Ahmed M. El-Hanafy, G. E Abdelrahman, Y. G Youssef, A. E Abdeltawab
HBRC Journal
Mechanically Stabilized Earth Walls (MSEWs) are widely used for their ease of construction and cost-effectiveness. Current design equations primarily focus on two-dimensional approaches for straight sections, overlooking the unique challenges posed by curved sections. This study investigates the behaviour of convex curved sections in MSE walls under various factors. Field measurements were conducted on block-type MSE walls with a convex curved section to address gaps in design criteria. Measurements included lateral displacements and strain behaviour at different curve locations, with data collected from the curve start, centreline, and a straight section. The results revealed that horizontal displacements and strains were …
Performance Of Reinforced Soft Soil Using Geogrid-Encased Granular Piles Under An Embankment,
2025
Department of Civil Engineering, Faculty of Engineering, Geotechnical and Foundations Engineering at University of Tabuk, Tabuk 71491, Saudi Arabia and Department of Civil Engineering, Faculty of Engineering, Geotechnical and Foundations Engineering at Aswan University, Aswan 81542, Egypt
Performance Of Reinforced Soft Soil Using Geogrid-Encased Granular Piles Under An Embankment, Mohamed Elsawy
HBRC Journal
Geosynthetic encasements are used to promote the water outlet and reinforcement efficiency of stone piles in weak soil. The current study focuses on simulating an embankment with field measurements built on soft soil improved by conventional stone piles (CSPs). Both 3D and 2D plane strain models were employed to model various embankment components. The granular piles were improved with geosynthetic materials to evaluate the encasement leverage on the stone piles performance in soft soil. Consolidation process was conducted to examine the reinforced clay behavior at long-term conditions. The finite element analyses findings indicated good matching with field measurements for soft …
Cost Analysis For The Application Of Recycled Materials In Road Subgrade Layer: A Case Study In Egypt,
2025
Researcher, Civil Engineering Department, Faculty of Engineering at Shoubra, Benha University
Cost Analysis For The Application Of Recycled Materials In Road Subgrade Layer: A Case Study In Egypt, Norhan Sayed Zayed, Anwar B. Badawy Abo-Sena, Tarek M. Attia, Alaa Ahmed
HBRC Journal
Egypt’s construction industry has lately experienced rapid growth, particularly for infrastructure and road projects. This expansion has exacerbated a pressing issue: the accumulation of Construction and Demolish Wastes (CDW). To tackle this challenge, there is a growing proposal to recycle CDW in construction projects. This research aims to assess the economic and environmental implications of integrating recycled materials into road subgrade layers, contrasting their benefits with those of natural materials. The research methodology involved a comprehensive analysis of subgrade material characteristics based on Egyptian code requirements. A comparative analysis was conducted to evaluate the economic and environmental impacts …
