This research aims to optimize the production of Alfian's Cassava Stick to obtain maximum profit in Imron Rosidi's business. Alfian's Cassava Stick is a snack in Gunungkidul made from cassava. This study uses a linear programming model to determine the optimal production plan that maximizes profits while meeting production and resource constraints. Data was collected through observation, interviews and documentation. The results showed that the optimal production plan was to produce 100 packs of original cassava sticks and 200 packs of spicy cassava sticks per week. The maximum profit earned is IDR 1,200,000.00 per week. This study concludes that the linear programming model is an effective tool for optimizing the production of Alfian's Cassava Stick and maximizing profits. The findings of this research can provide insights for similar businesses in optimizing production plans and increasing their profitability.
{"title":"Optimizing Alfian's Cassava Stick Production to Maximize Business Profits Imron Rosidi","authors":"Dede Haerohmansyah, Endarti Puspitasari, Dwi Agustina Kurniawati","doi":"10.4028/p-jdqjl9","DOIUrl":"https://doi.org/10.4028/p-jdqjl9","url":null,"abstract":"This research aims to optimize the production of Alfian's Cassava Stick to obtain maximum profit in Imron Rosidi's business. Alfian's Cassava Stick is a snack in Gunungkidul made from cassava. This study uses a linear programming model to determine the optimal production plan that maximizes profits while meeting production and resource constraints. Data was collected through observation, interviews and documentation. The results showed that the optimal production plan was to produce 100 packs of original cassava sticks and 200 packs of spicy cassava sticks per week. The maximum profit earned is IDR 1,200,000.00 per week. This study concludes that the linear programming model is an effective tool for optimizing the production of Alfian's Cassava Stick and maximizing profits. The findings of this research can provide insights for similar businesses in optimizing production plans and increasing their profitability.","PeriodicalId":512976,"journal":{"name":"Engineering Headway","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140698854","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}
Suherman Suherman, Abdullah Ilmi, Muhammad Sabri, A. S. Silitonga
The world's energy needs to be enhanced after the COVID-19 pandemic has caused a shortage of petroleum-based fuels that has occurred in almost all countries in the world. It is essential to use non-edible vegetable oil as a renewable energy source. This study aimed to produce Schleichera Oleosa oil as biodiesel using a homogeneous catalyst (KOH). This study uses the ester/transesterification method in which Schleichera oleosa oil (SO) is heated in a 1L double jacket reactor at 60 °C. The results showed that the optimum conditions were obtained at 0.75 vol% KOH and an agitation speed of 1000 rpm with a reaction time of 90 minutes. This condition resulted in a biodiesel yield of 89%. Furthermore, it was found that the high oxidation stability was 9.03 h, and the pour point was 9 °C. Thus, the physicochemical biodiesel produced is acceptable according to the ASTM 6751 standard.
{"title":"Effect of Reaction Time on Production Biodiesel of Schleichera oleosa","authors":"Suherman Suherman, Abdullah Ilmi, Muhammad Sabri, A. S. Silitonga","doi":"10.4028/p-2duepe","DOIUrl":"https://doi.org/10.4028/p-2duepe","url":null,"abstract":"The world's energy needs to be enhanced after the COVID-19 pandemic has caused a shortage of petroleum-based fuels that has occurred in almost all countries in the world. It is essential to use non-edible vegetable oil as a renewable energy source. This study aimed to produce Schleichera Oleosa oil as biodiesel using a homogeneous catalyst (KOH). This study uses the ester/transesterification method in which Schleichera oleosa oil (SO) is heated in a 1L double jacket reactor at 60 °C. The results showed that the optimum conditions were obtained at 0.75 vol% KOH and an agitation speed of 1000 rpm with a reaction time of 90 minutes. This condition resulted in a biodiesel yield of 89%. Furthermore, it was found that the high oxidation stability was 9.03 h, and the pour point was 9 °C. Thus, the physicochemical biodiesel produced is acceptable according to the ASTM 6751 standard.","PeriodicalId":512976,"journal":{"name":"Engineering Headway","volume":"26 29","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140696544","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}
Recycling garbage with the pyrolysis technique to make liquid smoke is one effort to utilize biomass waste. Because it includes acetic acid and phenol, which aid in food preservation, liquid smoke can be used on foods. The goal of this research was to look into the usage of zeolite catalysts in the production of liquid smoke from various types of biomass via catalytic pyrolysis. Coconut shells, corn cobs, and rice husks are used as biomass. The investigation began with the activation of the zeolite catalyst, with the goal of cleansing the catalyst of impurities and boosting its activity by opening the pores. The catalytic pyrolysis process was then carried out at 350°C for 2 hours while adjusting the quantity of catalyst addition (4%, 5%, and 6%). Catalytic pyrolysis liquid smoke is collected and evaluated. As a preservative, studied liquid smoke is applied to skipjack tuna. Based on the quality of commercial liquid smoke, the results showed that coconut shell liquid smoke with a percentage of 6% zeolite added was the most optimal liquid smoke. 6.5% yield, yellowish brown hue, slightly pungent aroma, pH value 2, density 1.132 g/ml, acid content 24%, and viscosity 1.3090 cP were the features of 6% zeolite coconut shell liquid smoke.
{"title":"Coconut Shell, Rice Husk, and Corn Cob Pyrolysis with Zeolite Catalyst","authors":"Khalimatus Sa’diyah, Christyfani Sindhuwati, Profiyanti Hermin Suharti, Fatkhur Rohman, Cucuk Evi Lusiani","doi":"10.4028/p-hjtvs0","DOIUrl":"https://doi.org/10.4028/p-hjtvs0","url":null,"abstract":"Recycling garbage with the pyrolysis technique to make liquid smoke is one effort to utilize biomass waste. Because it includes acetic acid and phenol, which aid in food preservation, liquid smoke can be used on foods. The goal of this research was to look into the usage of zeolite catalysts in the production of liquid smoke from various types of biomass via catalytic pyrolysis. Coconut shells, corn cobs, and rice husks are used as biomass. The investigation began with the activation of the zeolite catalyst, with the goal of cleansing the catalyst of impurities and boosting its activity by opening the pores. The catalytic pyrolysis process was then carried out at 350°C for 2 hours while adjusting the quantity of catalyst addition (4%, 5%, and 6%). Catalytic pyrolysis liquid smoke is collected and evaluated. As a preservative, studied liquid smoke is applied to skipjack tuna. Based on the quality of commercial liquid smoke, the results showed that coconut shell liquid smoke with a percentage of 6% zeolite added was the most optimal liquid smoke. 6.5% yield, yellowish brown hue, slightly pungent aroma, pH value 2, density 1.132 g/ml, acid content 24%, and viscosity 1.3090 cP were the features of 6% zeolite coconut shell liquid smoke.","PeriodicalId":512976,"journal":{"name":"Engineering Headway","volume":"110 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140698721","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}
Landsat satellite images are images that represent the ocean and land areas of the earth. Image data can be used for various purposes such as environmental analysis, remote sensing, mapping, and others. However, the quality of Landsat imagery is often unsatisfactory due to interference or noise from sources such as sensors, transmission, atmosphere, and storage. Therefore, they can reduce the contrast, sharpness, and information of landsat satellite images. Some of these disturbances prevent people from obtaining clear geographical locations. In order to overcome this problem, an effective and efficient method of Landsat satellite image quality improvement is needed. This research uses an image improvement method, namely discrete cosine transformation. The discrete cosine transformation method is used to reduce image noise by dividing it into each basic element. The method can perform the calculation process metematically and applicatively in the process of Landsat satellite image improvement. The processed results obtained are used to design and implement Landsat satellite image enhancement using the discrete cosine transformation method.
{"title":"Landsat Satellite Image Quality Improvement Using Discrete Cosine Transform Method","authors":"Deddy Rahmadi, Silvia Rachmawati","doi":"10.4028/p-bvfs09","DOIUrl":"https://doi.org/10.4028/p-bvfs09","url":null,"abstract":"Landsat satellite images are images that represent the ocean and land areas of the earth. Image data can be used for various purposes such as environmental analysis, remote sensing, mapping, and others. However, the quality of Landsat imagery is often unsatisfactory due to interference or noise from sources such as sensors, transmission, atmosphere, and storage. Therefore, they can reduce the contrast, sharpness, and information of landsat satellite images. Some of these disturbances prevent people from obtaining clear geographical locations. In order to overcome this problem, an effective and efficient method of Landsat satellite image quality improvement is needed. This research uses an image improvement method, namely discrete cosine transformation. The discrete cosine transformation method is used to reduce image noise by dividing it into each basic element. The method can perform the calculation process metematically and applicatively in the process of Landsat satellite image improvement. The processed results obtained are used to design and implement Landsat satellite image enhancement using the discrete cosine transformation method.","PeriodicalId":512976,"journal":{"name":"Engineering Headway","volume":"99 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140695178","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}
Astri Arnamalia, E. Sedyadi, Dodi Irwanto, Esti Wahyu Widowati
Preparation of Edible Film with the Addition of Red Ginger Extract (Zingiber Officinale Var. Rubrum) and Its Application to Tomato (Lycopersicum esculentum) has been carried out. The purpose of this study was to analyze the optimum concentration of adding red ginger extract to edible films on the physical and mechanical properties and to analyze the optimum concentration of adding red ginger extract to edible films on the shelf life of tomatoes. The working principle of making edible films is by varying the red ginger extract 0; 0.25; 0.50; 0.75 and 1% were analyzed by testing the thickness, tensile strength, elongation, young's modulus, and WVTR as well as analyzing the addition of red ginger variations 0; 0.25; 0.50; 0.75 and 1% for testing the shelf life of tomatoes in the form of texture tests and FTIR tests. The addition of red ginger variations had a significant effect (p<0.05) on the thickness, tensile strength, elongation, and modulus of young edible film at the optimum concentration of 0.50% with a thickness value of 0.100 mm, tensile strength 4.696 Mpa, elongation 0.194%, modulus young 26.68 Mpa, and WVTR 15.85 g/m2.hour.
{"title":"Pysicomechanical Properties of Edible Film with the Addition of Red Ginger (Zingiber Officinale Var. Rubrum)","authors":"Astri Arnamalia, E. Sedyadi, Dodi Irwanto, Esti Wahyu Widowati","doi":"10.4028/p-jwxo1g","DOIUrl":"https://doi.org/10.4028/p-jwxo1g","url":null,"abstract":"Preparation of Edible Film with the Addition of Red Ginger Extract (Zingiber Officinale Var. Rubrum) and Its Application to Tomato (Lycopersicum esculentum) has been carried out. The purpose of this study was to analyze the optimum concentration of adding red ginger extract to edible films on the physical and mechanical properties and to analyze the optimum concentration of adding red ginger extract to edible films on the shelf life of tomatoes. The working principle of making edible films is by varying the red ginger extract 0; 0.25; 0.50; 0.75 and 1% were analyzed by testing the thickness, tensile strength, elongation, young's modulus, and WVTR as well as analyzing the addition of red ginger variations 0; 0.25; 0.50; 0.75 and 1% for testing the shelf life of tomatoes in the form of texture tests and FTIR tests. The addition of red ginger variations had a significant effect (p<0.05) on the thickness, tensile strength, elongation, and modulus of young edible film at the optimum concentration of 0.50% with a thickness value of 0.100 mm, tensile strength 4.696 Mpa, elongation 0.194%, modulus young 26.68 Mpa, and WVTR 15.85 g/m2.hour.","PeriodicalId":512976,"journal":{"name":"Engineering Headway","volume":"319 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140698288","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}
Yusuf Saputro, Muhammad Wakhid Musthofa, Ira Setyaningsih
Online shopping has become the right choice to avoid crowds and maximize social distancing during the Covid-19 pandemic. The restrictions on activities and staying at home during the pandemic have shifted consumer behavior towards digitalization, relying on e-commerce and social media for shopping. The shopping trend in the Jabodetabek area has shifted from offline shopping in malls to online shopping through various e-commerce applications. This research aims to determine the influence of Price (X1), Promotion (X2), Ease of Use (X3), and Flexibility (X4) on the Shopping Behavior of the Jabodetabek community (Y), which has now shifted from offline stores to e-commerce. This research uses linear regression with hypothesis testing using t-test, F-test, and coefficient of determination. The results of the study indicate a significant influence of X2 on Y, X3 on Y, and X4 on Y, while there is no significant influence of X1 on Y. However, there is a significant simultaneous influence of variables X1, X2, X3, and X4 on variable Y with a determination coefficient level of 78%.
在 Covid-19 大流行期间，网上购物已成为避开人群和最大限度拉近社交距离的正确选择。大流行期间的活动限制和呆在家中的情况使消费者的行为转向数字化，依赖电子商务和社交媒体进行购物。Jabodetabek 地区的购物趋势已从在商场的线下购物转向通过各种电子商务应用程序进行在线购物。本研究旨在确定价格（X1）、促销（X2）、易用性（X3）和灵活性（X4）对 Jabodetabek 社区（Y）购物行为的影响。本研究采用线性回归法，使用 t 检验、F 检验和决定系数进行假设检验。研究结果表明，X2 对 Y 有显著影响，X3 对 Y 有显著影响，X4 对 Y 有显著影响，而 X1 对 Y 没有显著影响，但变量 X1、X2、X3 和 X4 同时对变量 Y 有显著影响，决定系数水平为 78%。
{"title":"Analysis of the Influence of Promotion, Price, Ease of Use, and Flexibility on Shopping Behavior of E-Commerce Users in Jabodetabek","authors":"Yusuf Saputro, Muhammad Wakhid Musthofa, Ira Setyaningsih","doi":"10.4028/p-hbv7qo","DOIUrl":"https://doi.org/10.4028/p-hbv7qo","url":null,"abstract":"Online shopping has become the right choice to avoid crowds and maximize social distancing during the Covid-19 pandemic. The restrictions on activities and staying at home during the pandemic have shifted consumer behavior towards digitalization, relying on e-commerce and social media for shopping. The shopping trend in the Jabodetabek area has shifted from offline shopping in malls to online shopping through various e-commerce applications. This research aims to determine the influence of Price (X1), Promotion (X2), Ease of Use (X3), and Flexibility (X4) on the Shopping Behavior of the Jabodetabek community (Y), which has now shifted from offline stores to e-commerce. This research uses linear regression with hypothesis testing using t-test, F-test, and coefficient of determination. The results of the study indicate a significant influence of X2 on Y, X3 on Y, and X4 on Y, while there is no significant influence of X1 on Y. However, there is a significant simultaneous influence of variables X1, X2, X3, and X4 on variable Y with a determination coefficient level of 78%.","PeriodicalId":512976,"journal":{"name":"Engineering Headway","volume":"20 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140697549","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}
There is a great deal of uncertainty regarding the factors that influence their final year grade, which includes their entry qualification. This paper investigates the impact of entry qualification and pre-university CGPA on student performance at the university level. Entry qualifications are critical for educational institutions or educational providers to ensure the quality of the graduates. The goal of this study is to analyze and compare performance of Bachelor of Science (Industrial Statistics) with Honours (BWQ) students. Total of 54 students were selected form the Faculty of Applied Sciences and Technology (FAST), Universiti Tun Hussein Onn Malaysia (UTHM). The students are coming from Malaysian Higher School Certificate (STPM) and Malaysian Matriculation Programme. Paired t test and Z test were carried out to analyze the impact of pre-university’s CGPA and each semester’s GPA as well as impact of entry qualification towards their final year grade. Classification and Regression Tree (CART), K-Nearest Neighbors and Naïve Bayes were used to develop and predict the students’ performance. The findings show that there is no relation between the result obtained from previous semester towards the next semester. Meanwhile, students from STPM outperform Matriculation in terms of their GPA per semester, pre-university CGPA as well as their final CGPA. The K-Nearest Neighbors and Naïve Bayes models have been documented as the most efficient data mining techniques in predicting student performance with the highest percentage of accuracy of 100%.
{"title":"Analysis on Students’ Academic Performance in Relation to the Results of Pre-University Examination","authors":"Chong Qi, Sabariah Binti Saharan","doi":"10.4028/p-gwn34t","DOIUrl":"https://doi.org/10.4028/p-gwn34t","url":null,"abstract":"There is a great deal of uncertainty regarding the factors that influence their final year grade, which includes their entry qualification. This paper investigates the impact of entry qualification and pre-university CGPA on student performance at the university level. Entry qualifications are critical for educational institutions or educational providers to ensure the quality of the graduates. The goal of this study is to analyze and compare performance of Bachelor of Science (Industrial Statistics) with Honours (BWQ) students. Total of 54 students were selected form the Faculty of Applied Sciences and Technology (FAST), Universiti Tun Hussein Onn Malaysia (UTHM). The students are coming from Malaysian Higher School Certificate (STPM) and Malaysian Matriculation Programme. Paired t test and Z test were carried out to analyze the impact of pre-university’s CGPA and each semester’s GPA as well as impact of entry qualification towards their final year grade. Classification and Regression Tree (CART), K-Nearest Neighbors and Naïve Bayes were used to develop and predict the students’ performance. The findings show that there is no relation between the result obtained from previous semester towards the next semester. Meanwhile, students from STPM outperform Matriculation in terms of their GPA per semester, pre-university CGPA as well as their final CGPA. The K-Nearest Neighbors and Naïve Bayes models have been documented as the most efficient data mining techniques in predicting student performance with the highest percentage of accuracy of 100%.","PeriodicalId":512976,"journal":{"name":"Engineering Headway","volume":"101 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140695243","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}
O.K. Ahmad Ariq, Widiana Nurrahmadhanti Bunga, E. M. Idzati, Firman Kurniawansyah, H. Ni’mah, H. B. T. M. Petrus, M. Mahfud
Silica based catalyst was prepared from geothermal sludge – solid waste from geothermal exploration - of Dieng Power Station, Central Java, Indonesia. The catalyst was prepared by extracting silica compound from the sludge matrix, followed by sulfonation to obtain sulfonated – solid catalyst. Catalyst sample analysis informed the catalyst was generally amorphous in structures, possessed surface area between 76 – 81 m2/g, with acidity approximately 5-6 mmol/g. Evaluation on catalyst activity was performed by applying it on sago starch hydrolysis - atmospheric pressure and 100 – 150°C (373 – 423 K) - in which more than 90 % conversion could be achieved.
{"title":"Development of Geothermal Sludge Derived - Silica Catalyst for Sago Starch Hydrolysis","authors":"O.K. Ahmad Ariq, Widiana Nurrahmadhanti Bunga, E. M. Idzati, Firman Kurniawansyah, H. Ni’mah, H. B. T. M. Petrus, M. Mahfud","doi":"10.4028/p-0sg5ae","DOIUrl":"https://doi.org/10.4028/p-0sg5ae","url":null,"abstract":"Silica based catalyst was prepared from geothermal sludge – solid waste from geothermal exploration - of Dieng Power Station, Central Java, Indonesia. The catalyst was prepared by extracting silica compound from the sludge matrix, followed by sulfonation to obtain sulfonated – solid catalyst. Catalyst sample analysis informed the catalyst was generally amorphous in structures, possessed surface area between 76 – 81 m2/g, with acidity approximately 5-6 mmol/g. Evaluation on catalyst activity was performed by applying it on sago starch hydrolysis - atmospheric pressure and 100 – 150°C (373 – 423 K) - in which more than 90 % conversion could be achieved.","PeriodicalId":512976,"journal":{"name":"Engineering Headway","volume":"26 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140696813","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}
M. Purwanto, M. A. Ramdani, Wildan Wahyu Firdhaus, R. Yogaswara
The Dual-Chamber Microbial Fuel Cell system has been successfully developed to produce bioelectricity based on tofu liquid waste. In this study, variations of the operating parameters of the MFC were carried out, namely differences in electrolyte solutions of potassium permanganate (KMnO₄) and potassium dichromate (K₂Cr₂O₇). In addition, the configuration of the reactor circuit used is a series reactor circuit and a single reactor. The results of the MFC process show that the maximum electric voltage and current strength values obtained in the KMnO₄ electrolyte solution are 880 mV and 0.352 mA, respectively. Meanwhile, the maximum electric voltage and current strength in the K₂Cr₂O₇ electrolyte solution are 569 mV and 0.228 mA. Furthermore, the use of potassium permanganate is known to produce a maximum power density of 20.88 mW/cm², which is two times greater than the maximum power density value produced by potassium dichromate, which is 8.73 mW/cm². Whereas the difference in the reactor series shows that the series reactor circuit can increase the maximum power density value of 356.61 mW/cm², higher than the single reactor which is 26.21 mW/cm². Based on all the data generated from this study, tofu liquid waste has the potential as the main ingredient in the MFC process to produce bioelectricity.
{"title":"Bioelectricity Production through Dual-Chamber Microbial Fuel Cell Using Tofu Liquid Waste: Effect of Differences in Electrolyte Solutions","authors":"M. Purwanto, M. A. Ramdani, Wildan Wahyu Firdhaus, R. Yogaswara","doi":"10.4028/p-4uqgg4","DOIUrl":"https://doi.org/10.4028/p-4uqgg4","url":null,"abstract":"The Dual-Chamber Microbial Fuel Cell system has been successfully developed to produce bioelectricity based on tofu liquid waste. In this study, variations of the operating parameters of the MFC were carried out, namely differences in electrolyte solutions of potassium permanganate (KMnO₄) and potassium dichromate (K₂Cr₂O₇). In addition, the configuration of the reactor circuit used is a series reactor circuit and a single reactor. The results of the MFC process show that the maximum electric voltage and current strength values obtained in the KMnO₄ electrolyte solution are 880 mV and 0.352 mA, respectively. Meanwhile, the maximum electric voltage and current strength in the K₂Cr₂O₇ electrolyte solution are 569 mV and 0.228 mA. Furthermore, the use of potassium permanganate is known to produce a maximum power density of 20.88 mW/cm², which is two times greater than the maximum power density value produced by potassium dichromate, which is 8.73 mW/cm². Whereas the difference in the reactor series shows that the series reactor circuit can increase the maximum power density value of 356.61 mW/cm², higher than the single reactor which is 26.21 mW/cm². Based on all the data generated from this study, tofu liquid waste has the potential as the main ingredient in the MFC process to produce bioelectricity.","PeriodicalId":512976,"journal":{"name":"Engineering Headway","volume":"1 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140697659","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}
Hakim Ar Rifki R., Salma El Achzaabi, Sherly Aprilia, Gagat Riano, Bambang Ismoyo
This study used the set covering problem (SCP) method to optimize the placement of F-16 Fighting Falcon fighters in the national air defense system (Sishanudnas). Then the results of the SCP maximized the covering capability by minimizing the average distance between air bases with the P-Median Problem (PMP). The results of this study show that the Air Force needs nine F-16 squadrons, to be able to cover all Indonesian airspace. However, if the requirements must include Air Bases that currently operate fighters as squadron deployment sites, the Air Force needs 11 squadrons of F-16 aircraft.
{"title":"Placement Optimization of Air Force Fighter in the National Air Defense System","authors":"Hakim Ar Rifki R., Salma El Achzaabi, Sherly Aprilia, Gagat Riano, Bambang Ismoyo","doi":"10.4028/p-ktnj3y","DOIUrl":"https://doi.org/10.4028/p-ktnj3y","url":null,"abstract":"This study used the set covering problem (SCP) method to optimize the placement of F-16 Fighting Falcon fighters in the national air defense system (Sishanudnas). Then the results of the SCP maximized the covering capability by minimizing the average distance between air bases with the P-Median Problem (PMP). The results of this study show that the Air Force needs nine F-16 squadrons, to be able to cover all Indonesian airspace. However, if the requirements must include Air Bases that currently operate fighters as squadron deployment sites, the Air Force needs 11 squadrons of F-16 aircraft.","PeriodicalId":512976,"journal":{"name":"Engineering Headway","volume":"22 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140695466","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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