http://journal.eu-jr.eu/engineering/issue/feedEUREKA: Physics and Engineering2024-01-31T14:43:48+02:00Tamara Belkoinfo@eu-jr.euOpen Journal Systems<p><strong>EUREKA: Physics and Engineering </strong>scientific journal whose main aim is to publish materials allowed to see <strong><em>new discoveries at the intersection of sciences.</em></strong></p>http://journal.eu-jr.eu/engineering/article/view/2949Non-linear dynamics of a test particle near the Lagrange points L4 and L5 (Earth-Moon and Sun-Earth case)2024-01-31T14:43:48+02:00Azem Hysaazemhysa@gmail.com<p>The two-bodies problem can be fully solved, and was solved by Kepler (1609) and Newton (1687). The general three-body problem is often given as an example of a mathematical problem that ‘can’t be solved’. So, there is no general analytical solution. This problem can be significant and a special case of this problem is the Circular Restricted Three-Body Problem (CRTBP), which can be applied to the Earth-Moon system with a spacecraft, the Sun-Earth system with an asteroid, etc. In this paper, let’s focus on the motion of a test particle near the triangular Lagrange points <em>L</em><sub>4</sub> and <em>L</em><sub>5 </sub>in the Earth-Moon and the Sun-Earth systems. Studying the movement of an object around these points is especially important for space mission design. To generate a trajectory around these points, the non-linear equations of motion for the circular restricted three-body problem were numerically integrated into MATLAB<sup>®</sup> 2023 software and the results are presented in the plane (<em>x</em>, <em>y</em>) and the phase plane (<em>x</em>, <em>v</em><sub>x</sub>) and (<em>y</em>, <em>v</em><sub>y</sub>). By numerical orbit integration, it is possible to investigate what happens when the displacement is relatively large or short from the Lagrange points. Then the small astronomical body may vibrate around these points. The results in this paper are shown in the rotating and inertia axes. Various initial positions near the Lagrange points and velocities are used to produce various paths the test particle can take. The same examples of numerical studies of trajectories associated with Lagrange points are shown in the inertial and the rotating coordinates system and are discussed. From the results of the numerical tests performed in MATLAB<sup>®</sup> 2023, it is possible to saw that there are different types of periodic, quasi-periodic, and chaotic orbits</p>2024-01-31T11:17:24+02:00Copyright (c) 2024 Azem Hysahttp://journal.eu-jr.eu/engineering/article/view/3050A rheophysical study of the non-newtonian behavior of water flow in thin channels2024-01-31T12:32:12+02:00Fuad Veliyevfuadveliev@hotmail.comAida Aslanovaaida.soltanova@bhos.edu.az<p>The development of low-permeable hydrocarbon reservoirs is becoming an increasingly urgent task, and therefore, the study of the laws of fluid movement in subcapillary pores and microcracks is a crucial scientific and technical problem. The previous experimental studies revealed that a viscous liquid during flow in low-permeable reservoirs exhibits an anomalous non-Newtonian character, accompanied by a violation of the linearity of the filtration process, and, consequently, Darcy's law. It was also established that starting from a certain critical size of the opening of the crack, the flow of a Newtonian fluid (water, viscous oil) becomes non-Newtonian, with the manifestation of an initial pressure gradient and flow locking. In this research work, rheophysical aspects of the non-Newtonian behavior of water during flow in thin rectangular channels are considered experimentally. Using the microchannel model, it is established that the nonlinear rheological effect in the flow of water in micro-slits is mainly caused by the value of the electrokinetic potential of the system, by reducing of which it is possible to significantly weaken the non-Newtonian nature of the fluid. To regulate the electrokinetic potential of the fluid system, an antistatic additive was used, the optimal concentration of which was established experimentally. The optimal concentration is defined to be 0.006 %. Based on the Bingham model, the rheological parameters of water flow were estimated at different micro-slit clearances changed in the range of 10÷25 micrometers, in the absence and presence of an antistatic additive. It is also established that a reduction in the electrical potential of the fluid flow leads to a significant decrease in the yield shear stress during the flow of water in the microchannel</p>2024-01-31T11:18:25+02:00Copyright (c) 2024 Fuad Veliyev, Aida Aslanovahttp://journal.eu-jr.eu/engineering/article/view/3057Investigation of electrical conductivity and electromagnetic wave absorption capabilities of water hyacinth biocarbon impregnated with Cu atom2024-01-31T12:32:12+02:00Sugeng Hadi Susiloshadis172.gh@gmail.comAzam Muzakhim Imanudinazam@polinema.ac.idTaufiq Rochmantaufiq.rochman@polinema.ac.idSupriatna Adhisuwignjosupriatna@polinema.ac.id<p>This paper discusses the impregnation of Cu atoms at carbonization temperature of water hyacinth bio carbon composite. This composite is used as an absorber of electromagnetic waves. Because the inference of electromagnetic waves can cause damage to other electronic equipment. In addition, electromagnetic wave radiation can cause various human health problems. The purpose of the research is to obtain a material that is able to absorb electromagnetic waves and increase electrical conductivity, impregnation of Cu atoms at carbonization temperature of water hyacinth bio carbon composite. The composite material uses a composition ratio of water hyacinth powder and phenol-formaldehyde of 30:70. The carburization temperatures used were 600 °C, 800 °C, and 1000 °C with a heat increase rate of 7 °C/minute. This study used Scanning Electron Micrograph (SEM), X-Ray Diffraction (XRD), LCR Meter, and vector network analyzer. The results show that the impregnation of Cu atoms at carbonization temperature can increase the area of the nanostructure, thereby increasing the formation of micropores in the composite. The higher the carbonization temperature, the percentage of Cu and carbon compounds can increase, while the percentage of crystal structure decreases. Impregnation of Cu atoms further strengthens the composite's absorption of electromagnetic wave radiation. Impregnation of Cu atoms in water hyacinth bio carbon composites at carbonization temperature can increase the electrical conductivity of the composite. The results of this research have potential applications in the electronics industry, batteries, and electrical devices, and can be used to protect devices from electromagnetic interference, especially in telecommunications and the medical field</p>2024-01-31T11:19:09+02:00Copyright (c) 2024 Sugeng Hadi Susilo, Azam Muzakhim Imanudin, Taufiq Rochman, Supriatna Adhisuwignjohttp://journal.eu-jr.eu/engineering/article/view/3148Prediction of air pollution from power generation using machine learning2024-01-31T12:32:12+02:00Thongchai Photsathianthongchai.p@eat.kmutnb.ac.thThitiporn Suttikulthitiporn.s@eat.kmutnb.ac.thWorapong Tangsriratworapong.ta@kmitl.ac.th<p>Electrical energy is now widely recognized as an essential part of life for humans, as it powers many daily amenities and devices that people cannot function without. Examples of these include traffic signals, medical equipment in hospitals, electrical appliances used in homes and offices, and public transportation. The process that generates electricity can pollute the air. Even though natural gas used in power plants is derived from fossil fuels, it can nevertheless produce air pollutants involving particulate matter (PM), nitrogen oxides (NO<em><sub>x</sub></em>), and carbon monoxide (CO), which affect human health and cause environmental problems. Numerous researchers have devoted significant efforts to developing methods that not only facilitate the monitoring of current air quality but also possess the capability to predict the impacts of this increasing rise. The primary cause of air pollution issues associated with electricity generation is the combustion of fossil fuels. The objective of this study was to create three multiple linear regression models using artificial intelligence (AI) technology and data collected from sensors positioned around the energy generator. The objective was to precisely predict the amount of air pollution that electricity generation would produce. The highly accurate forecasted data proved valuable in determining operational parameters that resulted in minimal air pollution emissions. The predicted values were accurate with the mean squared error (MSE) of 0.008, the mean absolute error (MAE) of 0.071, and the mean absolute percentage error (MAPE) of 0.006 for the turbine energy yield (TEY). For the CO, the MSE was 2.029, the MAE was 0.791, and the MAPE was 0.934. For the NOx, the MSE was 69.479, the MAE was 6.148, and the MAPE was 0.096. The results demonstrate that the models developed have a high level of accuracy in identifying operational conditions that result in minimal air pollution emissions, with the exception of NOx. The accuracy of the NOx model is relatively lower, but it may still be used to estimate the pattern of NOx emissions</p>2024-01-31T11:20:01+02:00Copyright (c) 2024 Thongchai Photsathian, Thitiporn Suttikul, Worapong Tangsrirathttp://journal.eu-jr.eu/engineering/article/view/3048Analysis of variation minor actinide pin configurations Np-237, AM-241, and Cm-244 in UN-PuN fueled pressurized water reactor2024-01-31T12:32:12+02:00Ratna Dewi Syarifahrdsyarifah.fmipa@unej.ac.idMuhammad Nasrullahmuhammadnasrullah080@gmail.comFajri Prasetyaprasfajri@gmail.comAhmad Muzaki Mabruriamuzaki073@gmail.comArtoto Arkundatoa.arkundato@unej.ac.idGaguk Jatisukamtogaguk.ft@unej.ac.idSepty Handayaniseptyhandayani@unej.ac.id<p>Actinide minor is a reactor waste with high toxicity and a long half-life. Minor actinides can be reduced by reusing them as fuel mixtures in reactors. This research uses PWR reactors with the primary fuel UN-PuN or Uranium Plutonium Nitride with a burning time of 5 years. The fuel consists of enriched Uranium, reactor-grade Plutonium from LWR waste, and minor actinides including Neptunium-237, Americium-241, and Curium-244. The purpose of this study was to find a design that is effective in reducing minor actinide waste. There are six designs or cases used in the addition of minor actinides. Each case has six minor actinide pins in each assembly. The addition of minor actinides is arranged in heterogeneous cores. The analysis was carried out by observing the values of <em>k</em>-eff, excess reactivity, and mass of minor actinides obtained from simulations using OpenMC code 0.13.2 and the ENDF/B-VIII library. The homogeneous core obtained an excess reactivity of 9.7 % with a percentage of plutonium of 8 %. The results of the homogeneous core are used as a reference for preparing a heterogeneous core. The heterogeneous core obtained an excess reactivity of 9.9 % with a percentage of plutonium <em>F</em>1: 5.5 %, <em>F</em>2: 8 %, and <em>F</em>3: 10.5 %. <em>Np-</em>237 can be reduced by 53 kg, and <em>Am-</em>241 can be reduced by 61 kg with minor actinide pins in case 1. <em>Cm-</em>244 can be reduced by 363 kilograms with minor actinide pins in case 6. Excess reactivity in the addition of <em>Np-</em>237 and <em>Am-</em>241 decreased to 5.3 %, while the accumulation of <em>Cm-</em>244 increased to 12.1 %.</p>2024-01-31T11:20:52+02:00Copyright (c) 2024 Ratna Dewi Syarifah, Muhammad Nasrullah, Fajri Prasetya, Ahmad Muzaki Mabruri, Artoto Arkundato, Gaguk Jatisukamto, Septy Handayanihttp://journal.eu-jr.eu/engineering/article/view/3074Applications of safety transient voltage suppressors in the track circuits of railway signaling systems2024-01-31T12:32:12+02:00Ukrit Kornkanokukritkorn@gmail.comSansak Deeonsdeeon2013@gmail.comSaktanong Wongcharoensaktanong.w@gmail.com<p>This research presented the utilization of Safety Transient Voltage Suppressors (STVS) in the track circuits of railway signaling systems, occurring during circuit switching due to changes in track occupancy conditions, resulting in damage and malfunction of the BR966F2 relay. The study employed Failure Modes and Effect Analysis (FMEA) combined with 1kV actual transient overvoltage testing featuring a waveform slope of 184/380 μs. Results revealed two transient voltage suppression levels encompassing Set A_(<em>a</em>,<em>b</em>), Set B_(<em>a</em>) and Set C_(<em>a</em>,<em>b</em>) as well as Set A//Set B//Set C and All Mode. These configurations achieved a clamping voltage of 41.6 V, categorized as Stage 1. Configurations like Set A_(<em>c</em>), Set B_(<em>b</em>,<em>c</em>) and Set C_(<em>c</em>) displayed increased series circuit behavior leading to a clamping voltage of 48.6 V, categorized as Stage 2. The application of STVS device in the track circuit of the signaling system reduced the transient voltage by diversion of the Transient Current or <em>I<sub>STVS</sub></em> through the STVS device into the ground system or the clamping voltage at the STVS device. This prevented the transient power from flowing into and damaging the relays of the track circuit, leaving only the clamping voltage with a missing peak wave. This contributed to the stability of the track circuit within the railway signaling system while also raising the Safety Integrity Level (SIL) to a higher standard, in accordance with the specifications of IEC 16508-4 and the unique requirements of the State Railway of Thailand. These enhancements increased the advanced safety system within the track circuit, particularly for train control and train operation functions of the State Railway of Thailand</p>2024-01-31T11:21:35+02:00Copyright (c) 2024 Ukrit Kornkanok, Sansak Deeon, Saktanong Wongcharoenhttp://journal.eu-jr.eu/engineering/article/view/3251Study of the influence of the technical level of railway vehicles on braking characteristics2024-01-31T12:32:12+02:00Ayaz Abdullaevayaz.abdullayev40@mail.ruIlham Huseynovil.huseynov@ady.azIsrail Elyazovelyazov-62@mail.ruRamin Abdullaevra.abdullayev@ady.az<p>In the article, the traction transmission of modern STADLER KISS trains is studied. The study of the effect of the technical level of the traction transmission on the braking characteristics of the train is discussed. The application of an innovative traction reducer is proposed, which allows to increase the result indicator according to the unit consumption of the traction transmission. Taking the reduction of the mass of the proposed thrust reducer as one of the main factors shaping the effect on the braking system, the possibility of reducing the inertia coefficient of the rotating parts and the technical parameters considered in the equation of motion of the train is shown. Taking into account the method of calculating the braking distance, the braking distance in different speed ranges is calculated in a practical example, by evaluating the braking efficiency, the possibility of reducing the braking distance by 5 % and reducing the braking time in proportion is shown. As a result of the experiments carried out by the researchers, it became clear that the technical level of traction transmission, consisting of multi-stage innovative reducers, directly affects the movement of trains. Thus, increasing the value of the coefficient of inertia of the rotating parts should allow accelerating the acceleration and braking times of the trains, passing the flats quickly, reducing the braking distance and saving some fuel resources. By conducting emergency braking tests, experimental values of the train's braking distance and braking time were determined and their compliance with the reported values was confirmed. Taking into account the advantages of the proposed reducer, a comparative description of the graphs of the dependence of braking distance and braking time on speed is given</p>2024-01-31T11:22:18+02:00Copyright (c) 2024 Ayaz Abdullaev, Ilham Huseynov, Israil Elyazov, Ramin Abdullaevhttp://journal.eu-jr.eu/engineering/article/view/3243Modeling of road damage prediction due to overload using HDM-4 method2024-01-31T12:32:12+02:00Muhammad Zainul Arifinmzaftub@gmail.comPrabowo PrabowoPbowo2000@gmail.comAgus Dwi Wicaksonoagusdwi@ub.ac.id<p>The road use load should essentially conform to the plan load as stated in the design guidelines. But in reality, the load received by the road is more than standard, so it has the potential to accelerate road damage. This study aims to predict the increase in the value of the International Roughness Index (IRI) and model the increase in value (IRI) due to overload. The approach method used in the analysis is the prediction of an increase in the IRI value due to excess load. The data collection method is carried out on road sections which include IRI values, vehicle load testing, CBR values and environmental conditions. The location of data collection is carried out on BTS Provincial Road. Surabaya City – Legundi. The analysis method for the prediction of the IRI value is the HDM-4 method, while to model the prediction of the increase in the IRI value is used exponential method with various parameters related to the results. The prediction results show that overload affects the increase in the IRI value. From the initial IRI value of 2.37, if the road is traversed by vehicles with standard loads for 20 years, the IRI value increases to 10.42. While the road traveled by overloaded vehicles within 20 years from an IRI value of 2.37 will increase to 16.88. With overload, the IRI value increases very sharply with the exponential model <em>y</em>=2.3583e<sup>0.0982<em>x</em></sup>. While the standard load by generating an exponential model <em>y</em>=2.3825e<sup>0.0739<em>x</em></sup>. From the results of the exponential model, load overload resulted in a significant increase in the IRI value with a growth rate of 0.0982. When compared to normal expenses which only experienced a growth rate of 0.0739. The modeling results show that overload will increase the growth of very high IRI values with the exponential model increase graph</p>2024-01-31T11:23:02+02:00Copyright (c) 2024 Muhammad Zainul Arifin, Prabowo Prabowo, Agus Dwi Wicaksonohttp://journal.eu-jr.eu/engineering/article/view/3248The study of the efficiency evaluation of the ventilation system of the poultry house in the summer2024-01-31T12:32:12+02:00Rovshan Hajiyevrovshanhajiyev888@gmail.comMehriban Huseynovahuseynova.mehriban.89@gmail.ruUrfan Taghiyevtagiyev.asau@gmail.ruGabil Mammadovm_qabil@rambler.ruGahira Allahverdiyevaqahire63@mail.ru<p>With the onset of cold weather, heat transfer through the walls and especially the roofs of bird rooms, unlike in the summer period, increases significantly, which leads to a sharp decrease in warm indoor air. Therefore, in order to maintain the regulatory conditions of the ventilation system, it is reduced to a transitional mode, and then to a minimum ventilation mode. Low ventilation repeatability limits inside the building determine the minimum volume of air supplied by the ventilation system. The economic and production efficiency of poultry farming is related to the premises and climatic conditions, which can seriously affect the well-being of broilers. Heat stress contributes to behavioral, physiological and biochemical changes in broilers, which leads to economic losses.</p> <p>The purpose of this study is to influence the annual efficiency of the poultry house ventilation system, mainly in summer, in order to evaluate the efficiency during the reconstruction of the cooling system, that is, to improve the ventilation system of the room, as well as to give an economic assessment of waste disposal technology.</p> <p>Energy– and resource-saving, environmentally friendly technologies and technological tools, plastic-type recuperators, a bird droppings removal system, as well as lighting and irrigation processes were taken as the object of the study. In conducting our research, let’s use classical and special methods, including a decomposition method for analyzing the functional use of recycling technology, a logical and linguistic method for assessing the safety of nitrogen during disposal, microclimate technology, nutrition and storage.</p> <p>Based on the mathematical model, a computer research methodology was developed to improve the energy efficiency of the poultry house. Using a computer program, the number of LEDs (α=200, <em>I</em>0=20 cd) for an enclosure measuring 66×12 m is <em>N</em>=273 pieces, and the number of LEDs (α=200, <em>I</em>0=20 cd) for a building measuring 78×18 m is <em>N</em>=259 pieces. The design parameters of the illuminators are justified</p>2024-01-31T11:23:49+02:00Copyright (c) 2024 Rovshan Hajiyev, Mehriban Huseynova, Urfan Taghiyev, Gabil Mammadov, Gahira Allahverdiyevahttp://journal.eu-jr.eu/engineering/article/view/2976Integration of FMEA and Bayesian network methods for risk assessment of components delay in ferry ship construction2024-01-31T12:32:12+02:00Zulfaidah Arianyzariany@live.undip.ac.idTrika Pitanatrika@its.ac.idIwan Vananyvanany@ie.its.ac.id<p>Construction of new ships in Indonesia. In this case study, the construction of a 600 DWT Ro-Ro ferry. The 600 DWT Shipbuilding Project involves various risks that may affect the schedule and results. A risk assessment involving the quality control team, project lead, and production management is carried out to identify and quantify the level of risk and its consequences.</p> <p>The results of this assessment assist in understanding and managing project risk, stress the importance of communication and coordination between teams, and enable better contingency planning and more effective project management. The FMEA calculation method is used to identify potential failure modes, determine the impact of each failure, and calculate a risk score based on the probability and effect of each failure. The Bayesian method updates the likelihood of failure based on new data that appears during the shipbuilding process. FMEA data is taken from the RPN (Risk Priority Number) at the Occurrence value, then weighted against the list of risks. Most risks are considered 'rare' in terms of likelihood and 'insignificant' in terms of consequence, indicating that despite potential obstacles, the impact on the project is expected to be minimal. However, several risks with 'minor' effects have been identified, highlighting the importance of effective risk planning and mitigation.</p> <p class="Abstract" style="text-align: justify; line-height: normal;">The integration of this method still needs to be improved, especially in the shipping industry. This method can be developed by making applications to control the procurement of materials at the beginning and during the construction and evaluation process at the end. The effort to make the ship construction timely according to the contract answers the shipbuilding challenges that often occur in developing countries</p>2024-01-31T11:24:45+02:00Copyright (c) 2024 Zulfaidah Ariany, Trika Pitana, Iwan Vananyhttp://journal.eu-jr.eu/engineering/article/view/3135Investigation and establishment of rational geometric factors of die in the deep drawing without a blank holder2024-01-31T12:32:12+02:00Duy Van DinhDuy.dinhvan@hust.edu.vnSinh Van NguyenSinh.nv195612@sis.hust.edu.vnAnh Ngoc PhamAnh.PN220028D@sis.hust.edu.vnLuc Van NguyenLuc.nv195519@sis.hust.edu.vnViet Duc DoViet.DD222217@sis.hust.edu.vn<p>Deep drawing is an operation to transform flat or hollow blanks to create hollow parts of the required shape and size. Deep drawing is an essential operation in sheet-forming technology to manufacture hollow parts. These parts are commonly used in the automobile, aviation, and household appliances industries. To prevent wrinkles on the rim part, a blank holder will be used to compress and flatten the workpiece before the metal is pulled into the die by the punch. Deep drawing without using workpiece holding force is applied to form hollow parts with low depth. In this case, the mould has a simple structure, helping to reduce manufacturing time and costs and making it easier to maintain and repair. The radius of the die is an essential parameter in deep drawing; it greatly affects the quality of products (making wrinkles and tears). However, this study has shown that, in deep drawing without using a blank holder, the cone angle of the die α has a major influence on the quality of the body and rim of the products, such as the products may or may not have wrinkles, either being thinned or thickened. This cone angle also affects the drawing force. This study has determined that, with α>120°, wrinkling begins to appear in the part wall, and wrinkling tends to increase as the angle α increases. The cone angle of the die for quality products is in the range of 100°<α≤120°. The taper angle smaller than 120° simultaneously increases the quality of the products and the cost of manufacturing die, so the most optimal value is determined by simulation and experimental verification as α=120°. The results of this study can be applied to fabricate hollow cylindrical parts with similar shapes when using the deep drawing method without using the blank holder</p>2024-01-31T11:25:30+02:00Copyright (c) 2024 Duy Van Dinh, Sinh Van Nguyen, Anh Ngoc Pham, Luc Van Nguyen, Viet Duc Dohttp://journal.eu-jr.eu/engineering/article/view/3220Research on the dynamics of a heavy mechanized bridge in the deployment phase of the lifting frame2024-01-31T12:32:12+02:00Tran Duc Thangthangdt135@mta.edu.vnDuong Van Levan_duong.le@lqdtu.edu.vnDat Van Chuvandat1903@gmail.com<p>This article presents a dynamic model of the TMM-3M heavy mechanized bridge during the frame lifting stage, which is driven by a hydraulic system, constituting the initial phase of the bridge erection process. The model is constructed as a multi-body dynamic system, taking into account the elastic deformation of the rear outriggers, front tires, and front suspension system. The research model integrates a mechanical system controlled by hydraulic cylinders, with pressure being considered as a variable reacting to external loads during the system's operation. Lagrangian equations of the second kind are utilized to establish a system of differential equations describing the oscillations of the system and form the basis for investigating the dynamics of the frame lifting process. The system of differential equations is solved numerically using MATLAB simulation software based on the Runge-Kutta algorithm. The study has revealed laws regarding the displacement and velocity of components within the system, evaluating the stability of the TMM-3M heavy mechanized bridge during operation. This research paves the way for a comprehensive understanding of the working process of the TMM-3M heavy mechanized bridge, aiming for practical improvements to minimize deployment or retrieval time, reduce the number of deployment team members, enhance the automation of the operation process to reduce the workload for operators</p>2024-01-31T11:26:18+02:00Copyright (c) 2024 Tran Duc Thang, Duong Van Le, Dat Van Chuhttp://journal.eu-jr.eu/engineering/article/view/3238Implementation of curcumin concentration coating to improve power efficiency in wireless power transfer2024-01-31T12:32:13+02:00Zainal Abidinzainal_fr@student.ac.idEko Siswantoeko_s112@ub.ac.idWidya Wijayantiwidya_dinata@ub.ac.idWinartowinarto@ub.ac.id<p>The research object in this research is the copper winding in the WPT system which characteristics will be observed after being coated with a concentration of curcumin. From the experiment of coating the curcumin concentration: H<sub>2</sub>O on the surface of the copper coil, it shows that there is an influence of physical phenomena from the curcumin concentration material. The strength of the magnetic field (<em>B</em>) and electric current (<em>I</em>) increased after the process of coating the concentration of curcumin: H<sub>2</sub>O on the copper coil for 0–5 hours. A coil wound with an electric current produces a strong magnetic field (<em>B</em><sub>1</sub>), while the curcumin compound (C<sub>20</sub>H<sub>21</sub>O<sub>6</sub>) contains two aromatic benzene rings which produce a strong magnetic field on 6p (<em>B</em><sub>2</sub>). Measuring the magnetic field strength using a Gauss meter after the curcumin concentration coating process showed an increase in the magnetic field strength and electric current. Assuming the equation for magnetic field strength <em>B</em>=<em>B</em><sub>1</sub>+<em>B</em><sub>2</sub>. Increasing the strength of the magnetic field and electric current in the copper winding of the wireless power transfer (WPT) system will affect the power efficiency of the copper windings <em>L</em><sub>1</sub> (transceiver) and <em>L</em><sub>2</sub> (receiver). The process of coating curcumin on a layer of copper to determine the electromechanical effect of curcumin. Utilization of curcumin as an alternative to increase power efficiency in WPT and increase conductivity in copper windings</p>2024-01-31T11:27:09+02:00Copyright (c) 2024 Zainal Abidin, Eko Siswanto, Widya Wijayanti, Winartohttp://journal.eu-jr.eu/engineering/article/view/2974Evaluation of mechanical and morphological properties composite of Agel Leaf Fiber (ALF)-epoxy modified with carbon powder2024-01-31T12:32:13+02:00Aris Budi Sulistyoaris.budi@poltradabali.ac.idWilly Artha Wirawanwillyartha@poltekbangsby.ac.idMukhlis Musliminmukhlis@unkhair.ac.id<p>This research focuses on the successful development of Agel Leaf Fiber (ALF)-Epoxy composites added with Carbon Active Powder (CAP) and printed using the Vacuum Pressure Infusion (VAPRI) method. Considering the importance of determining the mechanical properties of composites as raw materials for making fishing boats, this research aims to determine the use of Agel Leaf Fiber (ALF) in polymer matrix composites. The composite morphology was analyzed using Scanning Electron Microscopy (SEM) and ImageJ software. The mechanical properties evaluated included Tensile Strength, Flexural Strength, and Hardness. The composite was prepared by incorporating CAP in varying volumes of 0 %, 10 %, and 30 % with a fixed ALF percentage of 40 %. The results showed that the addition of CAP significantly increased the tensile strength to 128.51 MPa, with 0.068 % elongation, 1787.39 MPa modulus of elasticity, and a hardness value of 75.2 HD. Furthermore, the addition of 10 % carbon exhibited a remarkable improvement in flexural strength, reaching 238.51 MPa. This improvement could be attributed to reduced porosity, resulting in enhanced bonding between ALF-CAP-Epoxy components. The flexural strength of the composite with the highest CAP content experienced a significant increase of 238.51 MPa. Thus, Agel leaf fiber has the potential to be used as a reinforcing material in the manufacture of composites and is applied in the manufacture of environmentally friendly fishing boat bodies</p>2024-01-31T11:28:01+02:00Copyright (c) 2024 Aris Budi Sulistyo, Willy Artha Wirawan, Mukhlis Musliminhttp://journal.eu-jr.eu/engineering/article/view/2979Design of a model for improving emergency room performance using a colored Petri net2024-01-31T12:32:13+02:00Alvaro Jr Caicedo-Rolonalvarojuniorcr@ufps.edu.coGustavo Guerrero-Gomezgguerrerog@ufpso.edu.coFaustino Moreno-Gamboafaustinomoreno@ufps.edu.co<p>Emergency rooms are one of the most complex and vital areas of healthcare institutions, which have presented overcrowding, long waiting, and length of stay times, affecting the timeliness, responsiveness, and quality of service. This research aimed to design a detailed patient flow model to improve emergency room performance using the hierarchical timed colored Petri nets. Then, the model was simulated to evaluate scenarios considering tactical decisions such as physician staff planning, operational decisions such as adjusting work schedules, and strategic decisions such as increasing observation beds. The best scenario would reduce the average waiting times for triage II patients by 17.30 % and 47.57 %, and triage III by 33.49 % and 43.49 % for medical consultation in the office or the minor surgery room, respectively. In addition, the waiting time in observation and the rate of patients left without being seen by a physician would be reduced by 92.45 % and 74.67 %, respectively. These results improve the quality and timeliness of the service and avoid putting the patient's health and life at risk. The designed model included more attributes for patients concerning the place of medical care in the emergency room, the number of visits to the physician, and the physician who will care for the patient. Moreover, the simulation model includes observation beds as a limited resource blocking new patient admission. Finally, this model is a tool to support emergency room managers in making short, medium, and long-term decisions to address problems such as overcrowding, long waiting and length of stay times, and high rates of patients left without being seen by a physician</p>2024-01-31T11:28:50+02:00Copyright (c) 2024 Alvaro Jr Caicedo-Rolon, Gustavo Guerrero-Gomez, Faustino Moreno-Gamboahttp://journal.eu-jr.eu/engineering/article/view/3071Comparision of both methods psi and curli: applied in solving multi-objective optimization problem of turning process2024-01-31T12:32:13+02:00Do Duc Trungdoductrung@haui.edu.vnNguyen Thi Phuong Gianggiang.nguyenthiphuong@hust.edu.vnNguyen Hoai Sonnguyenhoaison@haui.edu.vn<p>Solving a multi-objective optimization problem involves finding the best solution to simultaneously satisfy multiple predefined objectives. Currently, various mathematical methods are available for solving optimization problems in general, and multi-objective optimization in particular. The comparison of mathematical methods when addressing the same problem has been explored in numerous studies. In this study, let’s conduct a comparison of two multi-objective optimization methods: the <em>PSI</em> method and the <em>CURLI</em> method. These two methods were applied collectively to tackle a multi-objective optimization problem related to a turning process. Experimental data were borrowed from a previous study, and a total of sixteen experiments were conducted. Roughness average (<em>Ra</em>), Roundness Error (<em>RE</em>), Tool Wear (<em>VB</em>), and Material Removal Rate (<em>MRR</em>) were the four output parameters measured in each experiment. The objective of solving the multi-objective optimization problem was to identify an experiment among the sixteen existing experiments that simultaneously minimized the three parameters of Ra, RE, and VB while maximizing MRR. The optimal results determined using the <em>PS</em>I and <em>CURLI</em> methods were also compared with the optimal results obtained through other methods (<em>COCOSO, MABAC, MAIRCA, EAMR</em> and <em>TOPSIS</em>) in published documents. The comparison results indicate that the optimal experiment found using the <em>CURLI </em>method consistently matches that of other methods. In contrast, the optimal results obtained through the PSI method differ significantly from those obtained through other methods. The Spearman correlation ranking coefficient between <em>CURLI</em> and the five methods <em>COCOSO, MABAC, MAIRCA, EAM</em>R, and <em>TOPSIS</em> is very high, ranging from 0.9 to 1. In contrast, this coefficient is very small when comparing <em>PSI </em>with the aforementioned five methods, falling within the range of –0.6088 to –0.3706 in this case. Ultimately, this study concludes that the <em>CURLI</em> method is suiTable for solving the multi-objective optimization problem in the turning process, whereas the PSI method is deemed unsuitable</p>2024-01-31T11:29:39+02:00Copyright (c) 2024 Do Duc Trung, Nguyen Thi Phuong Giang, Nguyen Hoai Sonhttp://journal.eu-jr.eu/engineering/article/view/3133Application of the multi-criteria analysis method mairca, spotis, comet for the optimisation of sustainable electricity technology development2024-01-31T12:32:13+02:00Ngoc-Tien Trantientn@haui.edu.vn<p>The development of sustainable electricity technology is of utmost importance in addressing the increasing energy demand while mitigating greenhouse gas emissions. Fossil fuel-based electricity generation is the primary contributor to air pollution and climate change, necessitating a shift towards renewable energy sources. The efficient production, distribution, and utilization of energy resources, along with ensuring affordable energy access and environmental sustainability, are key policy objectives for any country's energy sector. However, assessing sustainable electricity technologies is a complex task due to the diverse range of evaluation criteria and impacts associated with the practical implementation of these solutions. To overcome this challenge, this study proposes a multi-criteria decision-making (MCDM) approach to select the optimal solution for the development of sustainable electricity technology. The study employs several reliable methods, including MAIRCA, SPOTIS, COMET, and the CRITIC weighting method, to perform ranking evaluations. Based on this, an evaluation Table of criteria using linguistic variables is constructed. Furthermore, a ranking of methods for developing sustainable electricity technology is established by combining MCDM optimization methods. The results indicate that future energy policies should prioritize sustainable energy technologies, particularly water and solar thermal solutions. These findings have significant implications for development policymakers as the transition towards a sustainable energy system becomes increasingly crucial. In the future, the findings of this research can be further developed on a regional level, enabling the identification of the most appropriate energy technologies for specific regions based on their unique characteristics and requirements</p>2024-01-31T11:30:42+02:00Copyright (c) 2024 Ngoc-Tien Tran