Jurnal Teknologi
https://jurnal.umj.ac.id/index.php/jurtek
<p><a href="/index.php?journal=konversi&page=index" target="_self"><img style="float: right; width: 200px; height: 300px; margin-left: 10px;" src="/public/site/images/daruki/cover_issue_145_en_US.jpg" alt="" /></a></p><p style="font-size: 16px; text-align: justify;"><strong>Jurnal Teknologi </strong>Faculty of Engineering Universitas Muhammadiyah Jakarta is an international journal based on scientific research, routinely published by the Faculty of Engineering Universitas Muhammadiyah Jakarta since 2009 (print version), and started online in 2014 and from 2023 towards an Indexed International Journal using the English version.</p><ul><li style="font-size: 16px; text-align: justify;"><strong><a>p-ISSN: </a><a href="http://u.lipi.go.id/1329010440" target="_blank">2085-1669</a></strong> (print)</li><li style="font-size: 16px; text-align: justify;"><strong><a>e-ISSN: </a><a href="http://u.lipi.go.id/1431665373" target="_blank">2460-0288</a></strong> (online)</li></ul><p style="font-size: 16px; text-align: justify;"><strong>Jurnal Teknologi </strong><span>Accredited by the Ministry of Technology Research and Higher Education of Republic of Indonesia </span><strong><a href="https://risbang.ristekdikti.go.id/wp-content/uploads/2019/04/Salinan-Kepdirjen-Risbang-Tentang-Peringkat-Akreditasi-Jurnal-Ilmiah-Periode-II-Tahun-2019.pdf">No. 10/E/KPT/2019</a></strong><span> dated 4 April 2019. Validity period 2019-2024. </span><span><br /></span></p><p style="font-size: 16px; text-align: justify;"><strong>Jurnal Teknologi</strong> Faculty of Engineering, Universitas Muhammadiyah Jakarta invites lecturers, researchers, practitioners, industry, and observers as well as Undergraduate and Graduate students, to submit their research articles or review articles. Papers that come in will be peer-reviewed. Once the review process is complete, the review results will be informed to the paper's author through the Open Journal System (OJS). Jurnal Teknologi is published twice a year, every January and July in the English version.</p><p style="font-size: 16px; text-align: justify;"><a href="/index.php/jurtek/pages/view/indexing">Abstracted/Indexed in:</a></p><p style="font-size: 16px; text-align: justify;">Directory of Open Access Journals (DOAJ), Google Scholar, Indonesian Scientific Journal Database (ISJD), Copernicus, Garuda, Crossref, SINTA, Directory of Research Journal Indexing (DRJI), CiteFactor, Researchgate, Indonesia One Search, Academia.edu, Researchbib, Academickeys.com, Bielefeld Academic Search Engine (BASE), Jifactor, PKP Index, Sherpa Romeo.</p>Fakultas Teknik Universitas Muhammadiyah Jakartaen-USJurnal Teknologi2085-1669<p><strong>COPYRIGHT POLICY</strong></p><p>The author(s) of an article published in the Jurnal Teknologi retains ownership of the intellectual property rights in work (s).</p><p><strong>PUBLISHING RIGHTS</strong></p><p>The author(s) of an article published in the Jurnal Teknologi have unrestricted publication rights. The authors give the Jurnal Teknologi the right to publish the article and designate the Faculty of Engineering Universitas Muhammadiyah Jakarta Publishing as the original publisher of the article.</p><p><strong>LICENSING POLICY</strong><br />Journal of Mechanical Engineering and Sciences is an open-access journal that follows the Creative Commons Non-Commercial 4.0 International License (CC BY-NC 4.0), which states that: </p><p><img src="https://journal.ump.edu.my/public/site/images/fadhilah/mceclip0-881c53b8f0858e325c3674a87219f0e5.jpg" alt="" /><br />Under this license, the reusers must give appropriate credit, provide a link to the license, and indicate if changes were made. Users may do so in any reasonable manner, but not in any way that suggests the licensor endorses users or their use.<br />Please take the time to read the whole license agreement (<a href="https://creativecommons.org/licenses/by-nc/4.0/">https://creativecommons.org/licenses/by-nc/4.0/</a>). As long as reusers follow the license conditions, the owner cannot withdraw these freedoms. The following components are included under this license:</p><p><img src="https://journal.ump.edu.my/public/site/images/fadhilah/mceclip1-caa38af7bae86839b70d4517a31f0888.jpg" alt="" />Attribution: Users must provide appropriate attribution, including a link to the license, and indicate whether or not they made any modifications. Users are free to do so reasonably, but not in a manner that indicates the licensee approves of their usage.</p><p><img src="https://journal.ump.edu.my/public/site/images/fadhilah/mceclip2-712c200369c3075da84043b1cfa8c54a.jpg" alt="" />NonCommercial: Users may not use the material for commercial purposes.</p>Adsorbation of Carbon Monoxide Gas With Activated Carbon From Rubber Fruit Shells
https://jurnal.umj.ac.id/index.php/jurtek/article/view/12495
<p>Carbon Monoxide (CO) emitted by motorized vehicles can have a negative impact on human health. One way to absorb CO gas is with adsorption technology using activated carbon. Activated carbon has the potential to be used as an adsorbent. This research aims to study the efficiency of CO gas absorption in motorbike emissions using activated carbon from rubber fruit shells. Activated carbon was prepared by carbonization process at 500oC for 1 hour using 10% H3PO4 activator and sieving with a sieve size of 200 mesh. The operating conditions of the adsorption process that were varied were the length of the adsorbent, namely 3; 4; and 5 cm. The activated carbon product is then tested using proximate analysis. The results of proximate analysis show that activated carbon meets SNI 06-3730-1995 with a water content value of 7.6%; ash content 8.7%; volatile matter 8.2%; and fixed carbon 75.5%. The research results showed that the highest removal of CO gas emissions on motorbikes occurred at a contact time of 1 minute of 80.809% with a media thickness of 5 cm. The best adsorption capacity value occurred at a contact time of 1 minute, with an activated carbon media length of 3 cm, namely 158.635 mg/g.</p>Aryo SasmitaEdward EdwardRudea Faddhisrah Syahbana
Copyright (c) 2024 Jurnal Teknologi
2024-01-302024-01-3016111010.24853/jurtek.16.1.1-10IoT Platform for Monitoring Systems Water pH in the Freshwater Fish Cultivation Process
https://jurnal.umj.ac.id/index.php/jurtek/article/view/14776
<p>This study describes the implementation of the Internet of Things using the MQTT protocol and mosquitto as a broker combined with a 2x16 LCD for a pH monitoring system in a freshwater fish farming system at BPBIAT Purwakarta, West Java, Indonesia. To obtain accurate data, the calibration process is carried out in several stages, including using buffer 6.8 and distilled water. The calibration results on the 6.8 buffered liquid sample mean that the data obtained are appropriate, while the aquades obtained a value of 7.73, this is due to the storage factor of the distilled water so that it can change the pH value. The final result of the research shows that the data that appears online on the Node-Red dashboard is the same as that which appears locally on the 2x16 LCD. This means the MQTT protocol is working fine. The data displayed on the Node-Red UI is sent periodically every 30 minutes. The consideration is that, during the experiments, the pH value of the water did not change significantly beyond the range of 6.5-8.5. This data illustrates that the pH quality of the water for freshwater fish farming at BPBIAT is ideal for use.</p><!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF/> <w:LidThemeOther>EN-US</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w:DontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w:EnableOpenTypeKerning/> <w:DontFlipMirrorIndents/> <w:OverrideTableStyleHps/> </w:Compatibility> <m:mathPr> 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mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";} </style> <![endif]--><pre style="margin-bottom: .0001pt; mso-add-space: auto; text-align: justify; line-height: normal; background: #F8F9FA;"> </pre>Deni KurniaSlamet RiyadiDeshinta Arrova DewiAdolf Asih SupriantoOlivia Rahmadani
Copyright (c) 2024 Jurnal Teknologi
2024-01-302024-01-30161111610.24853/jurtek.16.1.11-16Design of a Passenger Ship Launch Using an Air Bag System
https://jurnal.umj.ac.id/index.php/jurtek/article/view/17863
<p>Ship launching is one of the stages of ship production before the ship is handed over to the owner, which marks the beginning of the ship's life. With the development of technology at this time, various launching methods have been developed, one of which is the launching method using an air bag system. Launching using air bags has many advantages compared to conventional launching methods that have been used so far. Pre-launch calculations are performed to avoid risks during the launch. Launching using air bags begins with calculating the weight plan of the ship launch and the preparation of the air bag layout. Using CB/T 3837:1998 Technological Requirements for Ship Upgrading or Launching Relying on Air Bags, Shipbuilding Industry Standard, and ISO 14409:2011 ships and marine technology-ship launching air bags, the number of air bag requirements and layout can be determined to support the ship launching process. The passenger ship, with an length overall of 62.80 metres, is planned to have a launch weight of 1058.881 tons. By using the QG6 high-bearing capacity air bag model with 6 layers of cord fabric with a diametre of one metre and a contact length between the air bag and the ship's body of ten metres, a total of 11 air bags are required in a linear arrangement to support the launch of a passenger ship. The distance between air bags is 2.07 metres to 5.736 metres, the longer the distance between air bags, the greater the load supported by each air bag.</p>Kharis AbdullahSryang T. Sarena
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2024-01-302024-01-30161172610.24853/jurtek.16.1.17-26Prediction of Onset Temperature in Standing Wave Thermoacoustic Engine with Mesh Screen Stack
https://jurnal.umj.ac.id/index.php/jurtek/article/view/14873
<p>A thermoacoustic engine is a engine that converts thermal energy into acoustic energy, which can be used to generate electricity or cooling. This engine is attractive because it consists only of a stack, heat exchangers, and a resonator. The stack serves as the primary component for the energy conversion process and consists of porous materials like an array of stainless steel mesh screens. To generate the acoustic energy, a minimum temperature difference is necessary between the two sides of the stack, called the onset temperature difference. However, the calculation for prediction of onset temperature on the stack made of mesh screen has not been addressed. Therefore, the objective of this paper is to propose a method that can be used to estimate the onset temperature difference in standing wave thermoacoustic engine with stacks made of mesh screen arrays. The onset temperature difference is predicted numerically using linear stability theory and matrix transfer methods. Experimental verification is carried out by using standing wave thermoacoustic engine from pervious study. The results showed that the lowest onset temperature difference (<em>T<sub>H</sub> - T<sub>C</sub></em> = 140ºC) is obtained when <em>r<sub>h</sub></em> = 0.497 mm. Furthermore, the numerical and experimental onset temperature difference comparisons show a qualitative agreement, allowing the onset temperature prediction method to be used in designing standing wave thermoacoustic engines with stacks made of mesh screens.</p>Prastowo MurtiWijayanti Dwi AstutiIkhsan SetiawanFakih IrsyadiImroatul Hudati
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2024-01-302024-01-30161273210.24853/jurtek.16.1.27-32Flettner Rotor Implication on Ship Ferry The Kalianget-Kagean Route Using Computational Fluid Dynamics
https://jurnal.umj.ac.id/index.php/jurtek/article/view/16643
<p>Ship's Ferries are a sea crossing that continues to operate around the time. The consequence related to shipping activities is an increase in ship exhaust emissions. One alternative for ship propulsion that is environmentally friendly is the Flettner rotor. The working principle of the tool follows the theory of the Magnus effect, where the force arises due to the difference in pressure between the two sides of the Flettner rotor. This study implicates the Flettner rotor on the Kalianget-Kangean ferry route with variations in wind speeds of 10, 15 and 20 knots and variations in dimensions of 3x1, 5x1 and 7x1 meters with a rotational speed of 500 rpm. Optimal results through computational fluid dynamics (CFD) simulations show a coefficient of lift (C<sub>L</sub>) of 3.647 and a lift force (F<sub>l</sub>) of 2,980,631.2 kilonewton with dimensions of 5x1 meters and a wind speed of 15 knots. While the implicit percentage of Flettner rotors in KMP. DBS I of 18.11%, KMP. DBS III of 11.27%, and KMP. NS 92 of 5.45%.</p>Akmal FirdausyahAli MunazidPrastyono Eko PambudiBagiyo Suwasono
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2024-01-302024-01-30161334010.24853/jurtek.16.1.33-40Investigation of Heat Exchanger Performance in The Heating Tank Section of Loop FASSIP 03 NT
https://jurnal.umj.ac.id/index.php/jurtek/article/view/17994
<p>The Passive System Simulation Facility (FASSIP) loop is an experimental test facility for a passive cooling system to recover the residual heat from decay produced by the reactor core during accident conditions. The Heating Tank Section (HTS) is one of the components of the FASSIP 03 NT facility. This component is equipped with a heat exchanger, 3 types of heat exchangers can be applied to HTS. Namely heat exchangers of the Straight Pipe Heat Exchanger (SPHE) type, the Straight Pipe Fins Heat Exchanger (SPFHE) type, and the Helical Pipe Heat Exchanger (HPHE) type. A modification was made to increase the efficiency of HTS, namely replacing the electric heater on the HTS from a ceramic band heater type to an immersion heater type. With this modification, it is necessary to know the performance of the heat exchanger on HTS and its speed in reaching operational temperature. The HPHE-type heat exchanger is more efficient than the SPHE-type and SPFHE-type heat exchangers. The HPHE-type heat exchanger has a much larger length of 5.5 m, so the thermal resistance (Rth) is very small, namely 0.003926 ℃/W. To reach the working fluid temperature in the range of 50 – 90 ℃, the HPHE-type heat exchanger requires 35 – 86 minutes.</p>Dedy HaryantoArif Adtyas BudimanMuhammad Ganjar PutraPutut Hery SetiawanMulya Juarsa
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2024-01-302024-01-30161415210.24853/jurtek.16.1.41-52Slope Stability Evaluation and Geometrical Recommendation Using The Morgenstern Price Method
https://jurnal.umj.ac.id/index.php/jurtek/article/view/18203
<p>The study is located on PT Indocement Tunggal Prakarsa Tbk., which is still actively engaged in mining operations. The study aimed to determine the slope Safety Factor (SF) and offer suggestions for safe slope geometry for mining operations. Primary data collection through observation of lithology conditions, sample testing in the laboratory, scanline mapping, slope geometry measurements, and secondary data obtained from company inventories and related sources. The kinematic approach is used to assess the risk of landslides. This slope stability study uses boundary equilibrium based on the Morgenstern Price and Mohr-Coulomb failure criteria. Limestone is the majority of the rocks in the location. The kinematic analysis demonstrated that direct toppling and wedge toppling are the landslide potential at the research location. Using the non-circular boundary equilibrium approach, slope stability analysis was carried out on four Regions with dry and saturated groundwater conditions i.e, Regions A', B140, C120, and C135. The four Regions have stable slopes and are in good condition (SF values over 1.25). For the excavation to be carried out optimally, the recommendations for optimization of the overall slope geometry are given, namely, the height of the bench is 10 m, and the width of the ladder is 4 m. The slope angle is 80<sup>o</sup>, with SF value of 3.035 in dry conditions and an SF value of 2.021 in saturated conditions. </p>Heri Matius SesaNajib NajibHasnan Luthfi DalimuntheZerlinda Handietri
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2024-01-302024-01-30161536410.24853/jurtek.16.1.53-64Optimization of Chicken Egg Distribution Cost Using Revised ASM Method (Case Study: Breeding Industry)
https://jurnal.umj.ac.id/index.php/jurtek/article/view/12285
<p>PT. IA is a company engaged in the manufacture of animal feed, producing chicken eggs and broiler chicken farm. The problems at PT. IA is amount of distribution costs incurred by the company, so the method needed to optimize disttribution costs. The purpose of this research is to determine the optimal distribution costs of chicken eggs, compare the distribution cost of chicken eggs before and after optimization, and compare the ASM method with Stepping Stone method. The method use to solve the probelum is using ASM method. ASM method is one of a method that can use to find the optimal solution without have to find the starting solution to minimize costs. Allocation product with ASM Method is done from the smallest index and the largest amount of supply, until all demand is met and supply out of stock. Based on the research, it shown the revision of ASM method is not necessarly able to provide the optimal solution directly to unbalanced transportation problems or the accurance of additional activities. The minimum total cost with ASM method is Rp. 586.800.000, while after test the optimization using Stepping Stone method the result is Rp. 585.300.000. The difference cost before and after optimization using the revised ASM method is Rp. 93.300.000 or decrease of 13.7%.</p>Vera DevaniChlarisya Rahmadani
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2024-01-302024-01-30161657410.24853/jurtek.16.1.65-74The Effect Of Pitch Ratio On Screw Turbine Performance With Tip Fin
https://jurnal.umj.ac.id/index.php/jurtek/article/view/17953
<p>A water turbine is an energy conversion machine that converts water head into shaft movement. In screw-type turbines, performance is influenced by several parameters including outer diameter, inner diameter, rotor length, head angle, number of blades, and pitch distance. This research uses a screw turbine type with a tip fin. The research aims to determine the performance of screw turbines with tip fins on mechanical power and efficiency. The research independent variables consist of pitch ratio and flow rate. The pitch ratio variations used are 1.2; 1.4 and 1.6 while the variations in flow rate used are 3 l/s, 3.5 l/s, and 4 l/s. The method used in this research is experimental. This study's data analysis employed the two-way Anova method with an alpha (α) of 5%. Anova's results show that the P-value of the interaction of the two independent variables, pitch ratio and water discharge, is <0.05, meaning that the independent variables have a significant influence on the performance of the screw turbine. The highest turbine performance results were at a pitch ratio of 1.4 at a water flow rate of 4 l/s resulting in an efficiency value of 34.91% and a mechanical power value of 6.82 watts at a rotational speed of 125 RPM. The lowest turbine performance results at a pitch ratio of 1.2 with a flow rate of 3 l/s resulting in an efficiency of 22.64% and a mechanical power of 3.32 watts at a rotational speed of 56 RPM.</p>Satworo AdiwidodoMasrur Maulana Ahmad
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2024-01-302024-01-30161758210.24853/jurtek.16.1.75-82Analysis of Proposed Waste Management Strategies at XYZ Islamic Boarding School Using SWOT and Promethee
https://jurnal.umj.ac.id/index.php/jurtek/article/view/18456
<p>As a country with a population of 261,115,456 people, Indonesia produces 65 million tons of waste per year. This large amount of waste is not matched by good waste management. Improving waste management must be done from the source, one of which is the XYZ boarding school. Thus, this study aims to determine the waste management strategy to improve waste management at the XYZ Islamic Boarding School. The determination of the process was carried out using the SWOT and Promethee methods. Based on the SWOT analysis results, alternative waste management strategies that can be implemented at the XYZ Islamic Boarding School are known. Furthermore, these alternatives are analyzed again to determine which options will be prioritized using the Promethee method. The results show that XYZ Islamic Boarding School can implement the SO strategy with a value of 4,830, and the priority strategies are conducting waste management training by trainers or teachers to employees of the boarding school, building waste management facilities in the boarding school area, and building good cooperation with waste management institutions.</p>Defi Milenia Putri WeshaDino Rimantho
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2024-01-302024-01-30161839410.24853/jurtek.16.1.83-94The Influence of Work Posture and Work Environment on Sick Building Syndrome in Port Service Company Employees
https://jurnal.umj.ac.id/index.php/jurtek/article/view/18035
<p>Sick Building Syndrome is a combination of health problems that a human feels only when doing activities inside a building. This situation is due to various factors, such as ergonomic factors and a work environment that is not in accordance with applicable regulations. The office building of the Port Service Company has poor building conditions, such as a poor ventilation system, some work facilities that are not ergonomic, and the physical environment of lighting and work climate that is not up to standard. This study was conducted to determine the general description of the incidence of SBS in the office building of the Port Services Company and to determine the effect of work posture and work environment on SBS complaints. The statistical method used in this study is binary logistic regression test. The results of statistical testing showed that work posture (p-value=0.018) and lighting (p-value=0.027) had an effect on sick building syndrome.</p>Juwitaning Sekar KinantiDewi KurniasihAulia Nadia Rachmat
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2024-01-302024-01-301619510410.24853/jurtek.16.1.95-104Effectivity Of Multi Tray Aerator As Pretreatment Process For Reverse Osmosis Membrane To Utilized As Raw Water At Sungai Itik Village
https://jurnal.umj.ac.id/index.php/jurtek/article/view/16513
<p>The community in Sungai Itik Village and its vicinity use river water for their daily needs, such as irrigation for agriculture, fish ponds, washing, bathing, and more. The quality of the river water has an iron (Fe) content of 2,64 mg/L, Total Dissolved Oxygen (TDS) of 347 mg/L, Dissolved Oxygen (DO) of 4,7 mg/L, a temperature of 29°C, and a pH of 5,4. The iron (Fe) content exceeds the standards set by PerMenKes No. 32 of 2017, requiring treatment using a multiple-tray aerator. This study aimed to determine the effective distance and number of trays in treating Sungai Itik's raw water, understand the coefficient of gas transfer (K<em><sub>La</sub></em>) in the aeration process, and find the optimum aeration time. This study employed a multiple-tray aerator consisting of 5 trays with variations in the tray distances at 30 cm, 40 cm, 50 cm, and 60 cm. Three repetitions were performed for each treatment, both without gravel and with gravel. The results of this study showed that the best reduction in Fe content was achieved by the treatment with gravel at a tray distance of 60 cm using 5 trays, resulting in a 6,64% reduction in Fe from an average value of 1,51 mg/L to 1,41 mg/L. The average pH value was 6,19, and the TDS was 890 mg/L. The highest oxygen transfer rate (K<em><sub>La</sub></em>) was obtained at a tray distance of 60 cm with gravel, averaging 0,2857/minute, and the optimum aeration time was 10 minutes.</p>Edo SeptiansyahRizki PurnainiMochammad Meddy Danial
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2024-01-302024-01-3016110511610.24853/jurtek.16.1.105-116Utilization of Sengon Wood Ash for Soil Stabilization and Its Impact on Unsoaked CBR Value
https://jurnal.umj.ac.id/index.php/jurtek/article/view/14195
<p>Soil is one of the critical factors influencing construction robustness. The land situated in Cibingbin Village, Cibaliung District, Pandeglang Regency, falls under the category of soil with low bearing capacity. Therefore, the soil in this area requires stabilization to enhance its load-bearing capacity. The field's CBR value, determined through DCP testing, was found to be 2.67%. The target CBR value for subgrade suitability is 6%, indicating the necessity for soil stabilization at this location. This study aims to assess the physical characteristics of the native soil and its CBR value after stabilization using sengon wood ash. Various percentages of sengon wood ash, namely 4%, 6%, 8%, 10%, and 12%, were utilized with curing periods of 0 and 3 days. Soil classification was performed using the USCS method, and the CBR test conducted was the unsoaked CBR test. The results revealed that the addition of 4% sengon wood ash, with a 3-day curing period, yielded an optimum CBR value of 7%. Sengon wood waste ash proved effective in increasing the CBR value. Furthermore, the use of sengon wood ash did not significantly reduce the plasticity index (PI) value. After stabilization with sengon wood ash, the PI value remained at 35.685%, categorizing it as highly plastic. Additional research is recommended to address the limitations of sengon wood ash and achieve a significant reduction in the PI value to meet the subgrade criteria</p>Woelandari FathonahEnden MinaRama Indera KusumaFahreza Ramdani
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2024-01-302024-01-3016111712610.24853/jurtek.16.1.117-126The Influence of Job Stress and Psychosocial Factors on Employee Performance through Leadership Quality
https://jurnal.umj.ac.id/index.php/jurtek/article/view/17961
<p>The development of Indonesia's industry is currently changing from commodity-based to manufacture-based. The manufacturing industry cannot be separated from the role of the packaging industry. So it is necessary to have Human Resources with good performance to be able to help achieve the goals and vision and mission of the company. Employee performance comes from two factors, namely individual factors and organizational environmental factors. The purpose of this study was to determine the effect of work stress and psychosocial factors consisting of job demands and work organization on employee performance in packaging companies through leadership quality. The method used is PLS-SEM with a sample of 75 people. The results showed that work stress had a significant effect on employee performance (p-value = 0.000), job demands and work organization had no significant effect on employee performance (p-value = 0.501 on job demands and p-value = 0.658 on work organization) , leadership quality has no significant effect on employee performance (p-value = 0.685), work stress has no significant effect on employee performance through leadership quality (p-value = 0.740), and job demands and work organization have no significant effect on employee performance through quality leadership (p-value=0.877 on job demands and p-value=0.725 on work organization). While the r-square value which shows the influence of work stress variables, job demands, work organization, and leadership quality on employee performance is 63.7%.</p>Zumrotin Nur AfifahDewi KurniasihFarizi Rachman
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2024-01-302024-01-3016112713610.24853/jurtek.16.1.127-136Implementation of Reliability Centered Maintenance (RCM) with Fuzzy Logic in Eliminating Off-Hangar Maintenance on Narrow Body Aircraft
https://jurnal.umj.ac.id/index.php/jurtek/article/view/20067
Aircraft maintenance in remote locations is a prevalent challenge for local airlines in Indonesia, leading to diminished productivity and efficiency in the maintenance division. This issue is substantiated by a significant incidence rate of 36% annually, as reported by a national airline. The current solution needed is the improvement of the Maintenance System to eliminate off-hangar maintenance for Narrow Body aircraft in the national aviation service industry. This study aims to identify the causal factors of aircraft requiring maintenance when located outside the primary maintenance facilities and to reduce these occurrences. The Reliability Centered Maintenance (RCM) method is employed to determine the most effective maintenance approach based on system and equipment reliability, and the fuzzy logic method in FMEA is utilized to address ambiguity and uncertainty in risk assessment. Primary data were obtained from Focus Group Discussions (FGD) with experts working in the airline industry. Secondary data were collected from all aircraft experiencing breakdowns outside the main hangar. The findings reveal that the primary factor for maintenance outside the main facilities is the current maintenance policy of Finding Failure (FF), which leads to unpredictable maintenance activities, resulting in damage outside the main facility areas (Batam, Cengkareng, and Surabaya). Incidents of maintenance outside the main facilities can be eliminated by shifting the policy to Time Directed (TD), enabling the company to reduce costs from an initial IDR 342,681,011,118.60 to IDR 70,370,514,198.60, achieving a cost saving of 79.47%.Singgih JuniawanChoesnul JaqinHerry Agung PrabowoUti RoysenFachrul AlamDaruki Daruki
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2024-01-292024-01-2916113715210.24853/jurtek.16.1.137-152Design of A Portable Solid-Fuel Rocket Stove
https://jurnal.umj.ac.id/index.php/jurtek/article/view/19706
<p>The depletion of fossil fuels is a hot topic of discussion these days. This is due to the increasing use of fossil fuels in human life. In terms of the increase in fuel and gas prices, we realise that the energy consumption that is increasing from year to year is not balanced with the availability of energy sources, which affects households that use fuel in the cooking process. So a design was carried out to make an ergonomic solid fuel stove with the aim of not using fuel anymore in the cooking process, in this design, the stove is designed to be more flexible and get a portable biomass rocket stove design by considering social aspects, performance, local resources, economy, environmentally friendly. Biomass fuels are solids, liquids or gases produced from organic matter.. Biomass fuels used in solid fuel stoves such as firewood, charcoal, briquettes and pellets. Each biomass fuel has different properties and characteristics. The designed portable rocket stove consists of several main parts namely combustion chamber, chimney, air duct, pan spot and cassing, using stainless steel material. The test results include combustion chamber and water temperature during the process, thermal efficiency, combustion rate and specific fuel consumption under cold start and hot start conditions. After hot start, it is found that the use of a chimney on a portable stove designed using coconut shell fuel is more effective than without a chimney. Shorter boiling time of 1 minute, greater combustion rate of 0.13 grams/minute, higher thermal efficiency of 2% and lower specific fuel consumption of 9.11 grams/litre of water when the stove uses a chimney.</p>Aljufri AljufriReza PutraAbdul RahmanRikki Mardian
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2024-02-012024-02-0116115316010.24853/jurtek.16.1.153-160Analysis of Variances in Flame Length of Time For Maggot BSF Oil with Several Types of Oil
https://jurnal.umj.ac.id/index.php/jurtek/article/view/19248
<p>Three problems are being faced simultaneously by Earth today: water (wastewater), energy, and food. However, considering the finite amount of land and the depletion of fossil fuels, this expansion is incompatible with the replenishment of natural resources in terms of both quantity and quality. Furthermore, another sustainable energy source that has gained international attention is biodiesel. However, research on the relative flash durations of Maggot BSFL oil has not been conducted. Consequently, this article will compare the flame times of many other types of oil with Maggot BSFL oil. This study uses a variety of oils as experimental subjects, including BSF maggot oil, used cooking oil, Pertamina Dex, and a combination of Pertamina Dex and BSF maggot oil. Analysis of the variations in flame time for each type of oil is done using statistical analysis. According to this analysis, the mixture of Maggot BSF oil and Pertamina Dex had the maximum flame, lasting between 16.31 and 16.44 minutes. Additionally, this study offers data on the notable variations in flame length for each type of oil, including used cooking oil, Pertamina Dex, Maggot BSF oil, and a combination of both. When creating biodiesel from Maggot BSF oil, the experiment's findings can serve as a starting point. in order for biodiesel made from Maggot BSF oil to provide Indonesia with a fresh option for the development of sustainable energy.</p>Dino RimanthoNur Yulianti HidayahVector Anggit PratomoAnwar Ilmar Ramadhan
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2024-02-012024-02-0116116116810.24853/jurtek.16.1.161-168