Pub Date : 2024-01-31DOI: 10.21303/2461-4262.2024.002976
Z. Ariany, T. Pitana, I. Vanany
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. 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. 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
{"title":"Integration of FMEA and Bayesian network methods for risk assessment of components delay in ferry ship construction","authors":"Z. Ariany, T. Pitana, I. Vanany","doi":"10.21303/2461-4262.2024.002976","DOIUrl":"https://doi.org/10.21303/2461-4262.2024.002976","url":null,"abstract":"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. \u0000The 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. \u0000The 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","PeriodicalId":11804,"journal":{"name":"EUREKA: Physics and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140476257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.21303/2461-4262.2024.003248
R. Hajiyev, Mehriban Huseynova, Urfan Taghiyev, Gabil Mammadov, Gahira Allahverdiyeva
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. 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. 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. 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, I0=20 cd) for an enclosure measuring 66×12 m is N=273 pieces, and the number of LEDs (α=200, I0=20 cd) for a building measuring 78×18 m is N=259 pieces. The design parameters of the illuminators are justified
{"title":"The study of the efficiency evaluation of the ventilation system of the poultry house in the summer","authors":"R. Hajiyev, Mehriban Huseynova, Urfan Taghiyev, Gabil Mammadov, Gahira Allahverdiyeva","doi":"10.21303/2461-4262.2024.003248","DOIUrl":"https://doi.org/10.21303/2461-4262.2024.003248","url":null,"abstract":"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. \u0000The 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. \u0000Energy– 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. \u0000Based 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, I0=20 cd) for an enclosure measuring 66×12 m is N=273 pieces, and the number of LEDs (α=200, I0=20 cd) for a building measuring 78×18 m is N=259 pieces. The design parameters of the illuminators are justified","PeriodicalId":11804,"journal":{"name":"EUREKA: Physics and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140474334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.21303/2461-4262.2024.002979
Alvaro Jr Caicedo-Rolon, G. Guerrero-Gómez, F. Moreno-Gamboa
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
急诊室是医疗机构中最复杂、最重要的区域之一，存在过度拥挤、等候时间长、停留时间长等问题，影响了服务的及时性、响应速度和质量。本研究旨在利用分层定时彩色 Petri 网设计一个详细的病人流模型，以提高急诊室的性能。然后，对模型进行仿真，以评估考虑了医生人员规划等战术决策、调整工作日程等运营决策以及增加观察床位等战略决策的方案。在最佳方案下，分流 II 病人在诊室或小手术室就诊的平均等候时间将分别缩短 17.30% 和 47.57%，分流 III 病人的平均等候时间将分别缩短 33.49% 和 43.49%。此外，观察等待时间和未得到医生诊治而离开的病人比率将分别减少 92.45 % 和 74.67 %。这些结果提高了服务的质量和及时性，避免了病人的健康和生命受到威胁。所设计的模型包含了更多的患者属性，涉及急诊室的医疗地点、看医生的次数以及照顾患者的医生。此外，模拟模型还将观察床作为一种有限资源，阻止新病人入院。最后，该模型是支持急诊室管理人员做出短期、中期和长期决策的工具，以解决人满为患、候诊时间长、住院时间长、未得到医生诊治的病人比例高等问题。
{"title":"Design of a model for improving emergency room performance using a colored Petri net","authors":"Alvaro Jr Caicedo-Rolon, G. Guerrero-Gómez, F. Moreno-Gamboa","doi":"10.21303/2461-4262.2024.002979","DOIUrl":"https://doi.org/10.21303/2461-4262.2024.002979","url":null,"abstract":"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","PeriodicalId":11804,"journal":{"name":"EUREKA: Physics and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140474540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.21303/2461-4262.2024.003133
Ngoc-Tien Tran
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
{"title":"Application of the multi-criteria analysis method mairca, spotis, comet for the optimisation of sustainable electricity technology development","authors":"Ngoc-Tien Tran","doi":"10.21303/2461-4262.2024.003133","DOIUrl":"https://doi.org/10.21303/2461-4262.2024.003133","url":null,"abstract":"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","PeriodicalId":11804,"journal":{"name":"EUREKA: Physics and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140471276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.21303/2461-4262.2024.002949
Azem Hysa
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 L4 and L5 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® 2023 software and the results are presented in the plane (x, y) and the phase plane (x, vx) and (y, vy). 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® 2023, it is possible to saw that there are different types of periodic, quasi-periodic, and chaotic orbits
{"title":"Non-linear dynamics of a test particle near the Lagrange points L4 and L5 (Earth-Moon and Sun-Earth case)","authors":"Azem Hysa","doi":"10.21303/2461-4262.2024.002949","DOIUrl":"https://doi.org/10.21303/2461-4262.2024.002949","url":null,"abstract":"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 L4 and L5 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® 2023 software and the results are presented in the plane (x, y) and the phase plane (x, vx) and (y, vy). 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® 2023, it is possible to saw that there are different types of periodic, quasi-periodic, and chaotic orbits","PeriodicalId":11804,"journal":{"name":"EUREKA: Physics and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140477361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.21303/2461-4262.2024.003243
Muhammad Zainul Arifin, Prabowo Prabowo, Agus Dwi Wicaksono
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 y=2.3583e0.0982x. While the standard load by generating an exponential model y=2.3825e0.0739x. 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
道路使用荷载基本上应符合设计准则中规定的计划荷载。但实际上，道路承受的荷载超过了标准，因此有可能加速道路损坏。本研究旨在预测国际路面粗糙度指数（IRI）值的增加，并对超载导致的（IRI）值增加进行建模。分析中使用的方法是预测超载导致的 IRI 值增加。数据收集方法在路段上进行，包括 IRI 值、车辆荷载测试、CBR 值和环境条件。数据收集地点位于 BTS 省道。泗水市 - Legundi。预测 IRI 值的分析方法是 HDM-4 方法，而预测 IRI 值增加的模型则使用了指数法，其中包含与结果相关的各种参数。预测结果表明，超载会影响 IRI 值的增加。初始 IRI 值为 2.37，如果车辆以标准载荷在道路上行驶 20 年，IRI 值会增加到 10.42。而超载车辆在 20 年内行驶的道路，IRI 值将从 2.37 增至 16.88。超载后，IRI 值会急剧增加，指数模型为 y=2.3583e0.0982x。而在标准负载下生成的指数模型为 y=2.3825e0.0739x。从指数模型的结果来看，超载导致 IRI 值显著增加，增长率为 0.0982。而正常开支的增长率仅为 0.0739。建模结果表明，超载将增加极高 IRI 值的增长，指数模型增长图
{"title":"Modeling of road damage prediction due to overload using HDM-4 method","authors":"Muhammad Zainul Arifin, Prabowo Prabowo, Agus Dwi Wicaksono","doi":"10.21303/2461-4262.2024.003243","DOIUrl":"https://doi.org/10.21303/2461-4262.2024.003243","url":null,"abstract":"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 y=2.3583e0.0982x. While the standard load by generating an exponential model y=2.3825e0.0739x. 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","PeriodicalId":11804,"journal":{"name":"EUREKA: Physics and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140476547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.21303/2461-4262.2024.003251
Ayaz Abdullaev, I. Huseynov, I. Elyazov, Ramin Abdullaev
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
本文对现代 STADLER KISS 列车的牵引传动装置进行了研究。文章讨论了牵引传动装置的技术水平对列车制动特性的影响。提出了创新型牵引减速器的应用方案，该方案可根据牵引传动装置的单位消耗量提高效果指标。将减少拟议的推力减速器的质量作为影响制动系统的主要因素之一，说明了减少旋转部件惯性系数和列车运动方程中考虑的技术参数的可能性。考虑到制动距离的计算方法，在一个实际例子中计算了不同速度范围内的制动距离，通过评估制动效率，显示了将制动距离减少 5%并按比例减少制动时间的可能性。研究人员的实验结果表明，由多级创新减速器组成的牵引传动装置的技术水平直接影响列车的运行。因此，提高转动部件的惯性系数值应能加快列车的加速和制动时间，快速通过平地，减少制动距离并节省一些燃料资源。通过进行紧急制动试验，确定了列车制动距离和制动时间的实验值，并确认其与报告值一致。考虑到拟议减速器的优点，对制动距离和制动时间与速度的关系图进行了比较说明
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Pub Date : 2023-11-30DOI: 10.21303/2461-4262.2023.003035
Tran Van Dua
Vietnam’s rice production accounts for a large proportion of rice production in region and the world. The income from rice production accounts for a large proportion of the Country’s total GDP (Gross Domestic Product). Therefore, the investment in machines for rice processing is being interested in this Country. Many types of rice processing machine need to be equipped such as rice harvesters, peelers, separators, etc. In which, the rice harvester is identified as the first type of machine that needs to be equipped for a rice processing line. However, with a large number of rice harvesters available on the market with many different parameters (specifications, selling price) will make it difficult for customers to choose the best rice harvester. In this paper, the selection of rice harvester is carried out using MCDM (Multi-Criteria Decision-Making) method. Five types of rice harvester were offered for ranking, including two drain-type rice harvesters and three bagged-type rice harvesters. Eighteen criteria were used to evaluate each machine type. Those eighteen criteria including: type of machine, length/ width/ height/ and weight of machine, length of the sprocket and width of the sprocket, maximum moving speed of the machine when working in slow-moving mode/ average-moving mode/ and fast-moving mode, ground clearance, cutting jaw width, cutting width, lowest cutting height, the maximum cutting height, the width of rake reel, the container capacity, and cost. To determine the weights for the criteria, three different methods have been applied. FUCA (Faire Un Choix Adéquat) was selected as a multi-criteria decision-making method to rank alternatives. The results identified one best drain-type rice harvester and one best bagged-type rice harvester
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Pub Date : 2023-11-30DOI: 10.21303/2461-4262.2023.002844
Luis Guillermo Obregón-Quiñones, Carlos Velázquez-Figueroa, M. Vanegas-Chamorro
Powder Mixing continues being of great importance in the field of particle technology because of the challenge to get homogeneous mixtures at a large scale. However, it is still moderately understood because of the complexity of designing 3D experiments that consider all the factors affecting the powder flow and powder mixing, hindering the acquisition of enough data that would provide a basic conception of powder behavior. This study involves a simple granular material mixing system of low friction that has five walls, where two of them are high friction moving walls following a cyclic function, and the others are non-friction static walls. The purpose was to create a complete set of 3D experiments of powder distribution to have a better insight into the inside mixing behavior as a function of the initial powder filling level. Experiments at different filling heights were run, obtaining the best mixing at the highest filling level. It was obtained a non-mixing zone with a triangle shape highly affected by the column particle weight. The increase of the vertical component of the resultant force produced by the acrylic motion walls causes a high momentum transfer in the x, y and z directions resulting in a decrease in the no-mixing zone. It was found an asymptotic behavior of the triangle height as a function of the initial filling height of the powders which indicates that values above a limited initial filling level will not have a significant effect on the triangle. A filling height increment of 100 % from 3.81 to 7.62 cm causes an increase in the mixing of 4.44 %. DEM simulations for mixing in the low-shear equipment were run to compare the experimental work
粉末混合在颗粒技术领域一直具有重要意义，因为它是在大规模条件下获得均匀混合物的挑战。然而，由于考虑到影响粉末流动和粉末混合的所有因素的三维实验设计非常复杂，阻碍了获取足够的数据来提供粉末行为的基本概念，因此人们对粉末混合的了解还很有限。本研究涉及一个简单的低摩擦颗粒物料混合系统，该系统有五面墙，其中两面为高摩擦运动墙，具有循环功能，其他为非摩擦静态墙。目的是创建一套完整的粉末分布三维实验，以便更好地了解内部混合行为与初始粉末填充水平的函数关系。在不同填充高度下进行了实验，在最高填充高度下获得了最佳混合效果。实验结果表明，非混合区呈三角形，受柱状颗粒重量的影响很大。丙烯酸运动壁产生的结果力的垂直分量增加，导致 x、y 和 z 方向的高动量传递，从而使非混合区缩小。研究发现，三角形高度是粉末初始填充高度的渐近函数，这表明超过限定初始填充高度的数值不会对三角形产生显著影响。填充高度从 3.81 厘米增加到 7.62 厘米，增加 100%，会导致混合增加 4.44%。对低剪切设备中的混合进行了 DEM 模拟，以比较实验结果
{"title":"Mixing of powders under periodic shear stress: effect of initial filling level","authors":"Luis Guillermo Obregón-Quiñones, Carlos Velázquez-Figueroa, M. Vanegas-Chamorro","doi":"10.21303/2461-4262.2023.002844","DOIUrl":"https://doi.org/10.21303/2461-4262.2023.002844","url":null,"abstract":"Powder Mixing continues being of great importance in the field of particle technology because of the challenge to get homogeneous mixtures at a large scale. However, it is still moderately understood because of the complexity of designing 3D experiments that consider all the factors affecting the powder flow and powder mixing, hindering the acquisition of enough data that would provide a basic conception of powder behavior. This study involves a simple granular material mixing system of low friction that has five walls, where two of them are high friction moving walls following a cyclic function, and the others are non-friction static walls. The purpose was to create a complete set of 3D experiments of powder distribution to have a better insight into the inside mixing behavior as a function of the initial powder filling level. Experiments at different filling heights were run, obtaining the best mixing at the highest filling level. It was obtained a non-mixing zone with a triangle shape highly affected by the column particle weight. The increase of the vertical component of the resultant force produced by the acrylic motion walls causes a high momentum transfer in the x, y and z directions resulting in a decrease in the no-mixing zone. It was found an asymptotic behavior of the triangle height as a function of the initial filling height of the powders which indicates that values above a limited initial filling level will not have a significant effect on the triangle. A filling height increment of 100 % from 3.81 to 7.62 cm causes an increase in the mixing of 4.44 %. DEM simulations for mixing in the low-shear equipment were run to compare the experimental work","PeriodicalId":11804,"journal":{"name":"EUREKA: Physics and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139206019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-30DOI: 10.21303/2461-4262.2023.003116
D. N. K. Putra Negara, T. G. Tirta Nindhia, I. Widiyarta, I. Karohika, Made Suarda, I. G. K. Dwijana
Domestic waste such as methylene blue from the dyeing process and detergent from laundry activities are sources of water pollution. Before being dumped into the water, this waste must be minimized. One approach that can be utilized is the adsorption method with activated carbon. To generate activated carbon with the properties required for this purpose, an appropriate precursor and manufacturing conditions must be chosen. The objective of this research is to investigate the characteristics and performance of activated carbon derived from various precursors (Petung and Santong bamboos) and activators (Ar, N2, and CO2) for detergent and methylene blue dye adsorption. The difficulty to be solved is determining the best precursor and activator for maximum methyl blue and detergent adsorption. Characterizations included FTIR, XRD, SEM, TGA, and adsorption isotherm testing. The study's findings show that activated carbons have functional groups O-H (hydroxyl), C-H (aldehydes and alkenes), C=C aromatic rings, C-H aromatic groups, and an amorphous structure. The presence of a porous and amorphous structure, as well as the C=C aromatic ring, makes activated carbons capable of absorbing methyl blue and detergent. Santong bamboo-activated carbon activated with argon has the best characteristics and adsorption capability. This activated carbon has a fixed carbon content of 76.34 %, pore volumes of 0.362 cc/g, average pore widths of 1.967 nm, pore surface area of 291.487 m2/g, bimodal pore size distribution, and methylene blue and detergent adsorption capabilities of 19.733 cc/g and 1.689 cc/g, respectively. The results obtained are on a laboratory scale, which necessitates additional research, particularly on how to create reservoirs and regenerate activated carbon simply and affordably
{"title":"Characteristics and performance analysis of activated carbons derived from different precursors and activators for waste water adsorption","authors":"D. N. K. Putra Negara, T. G. Tirta Nindhia, I. Widiyarta, I. Karohika, Made Suarda, I. G. K. Dwijana","doi":"10.21303/2461-4262.2023.003116","DOIUrl":"https://doi.org/10.21303/2461-4262.2023.003116","url":null,"abstract":"Domestic waste such as methylene blue from the dyeing process and detergent from laundry activities are sources of water pollution. Before being dumped into the water, this waste must be minimized. One approach that can be utilized is the adsorption method with activated carbon. To generate activated carbon with the properties required for this purpose, an appropriate precursor and manufacturing conditions must be chosen. The objective of this research is to investigate the characteristics and performance of activated carbon derived from various precursors (Petung and Santong bamboos) and activators (Ar, N2, and CO2) for detergent and methylene blue dye adsorption. The difficulty to be solved is determining the best precursor and activator for maximum methyl blue and detergent adsorption. Characterizations included FTIR, XRD, SEM, TGA, and adsorption isotherm testing. The study's findings show that activated carbons have functional groups O-H (hydroxyl), C-H (aldehydes and alkenes), C=C aromatic rings, C-H aromatic groups, and an amorphous structure. The presence of a porous and amorphous structure, as well as the C=C aromatic ring, makes activated carbons capable of absorbing methyl blue and detergent. Santong bamboo-activated carbon activated with argon has the best characteristics and adsorption capability. This activated carbon has a fixed carbon content of 76.34 %, pore volumes of 0.362 cc/g, average pore widths of 1.967 nm, pore surface area of 291.487 m2/g, bimodal pore size distribution, and methylene blue and detergent adsorption capabilities of 19.733 cc/g and 1.689 cc/g, respectively. The results obtained are on a laboratory scale, which necessitates additional research, particularly on how to create reservoirs and regenerate activated carbon simply and affordably","PeriodicalId":11804,"journal":{"name":"EUREKA: Physics and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139200219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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