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INDONESIA
Jurnal Teknologi
Published by Universitas Muhammadiyah Jakarta
ISSN : 20851669     EISSN : 24600288     DOI : -
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering
This journal is a scientific journal to develop knowledge in the field of Engineering & Technology. Editors invite professionals from education and researcher to write about the progress of science in the field of Engineering & Technology. The journal is published 2 (two) times in 1 year.
Arjuna Subject : -
Articles 303 Documents
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Analysis of Proposed Waste Management Strategies at XYZ Islamic Boarding School Using SWOT and Promethee Wesha, Defi Milenia Putri; Rimantho, Dino
Jurnal Teknologi Vol 16, No 1 (2024): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.16.1.83-94

Abstract

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.
Adsorbation of Carbon Monoxide Gas With Activated Carbon From Rubber Fruit Shells Sasmita, Aryo; Edward, Edward; Syahbana, Rudea Faddhisrah
Jurnal Teknologi Vol 16, No 1 (2024): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.16.1.1-10

Abstract

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.
Investigation of Thermal Conductivity and Dynamics Viscosity of Green Nanofluids (ZrO2-SiO2) Ramadhan, Anwar Ilmar; Saptaji, Kushendarsyah; Hendrawati, Tri Yuni; Sari, Alvika Meta; Umar, Efrizon; Aziz, Azmairit; Semendo, Rifqi Putra; Setiawan, Hanif Rama Yuda; Firmansyah, Firmansyah
Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.16.2.301-312

Abstract

In recent years, research has been directed towards improving the thermophysical properties of single-component nanofluids. Therefore, hybrid or composite nanofluids are developed to improve heat transfer performance. The thermophysical properties of ZrO2-SiO2 nanoparticles suspended in a mixture of water (W) and ethylene glycol (EG) with vol 60:40 or Green Nanofluids for various volume concentrations were investigated. Experiments were performed for volume concentrations of 0.1, 0.2, and 0.3% of green nanofluids at 50, 60, 70, and 80°C. Measurements of thermal conductivity and dynamic viscosity are performed at temperatures ranging from 50-80°C. The highest thermal conductivity of the green nanofluids is obtained at a concentration of 0.3%, and the maximum increase is up to 37.5% higher than the base fluid (EG/W). Meanwhile, evidence from the dynamic viscosity of green nanofluids is affected by concentration and temperature. Furthermore, the green nanofluids behave as a Newtonian fluid in a volume concentration of 0.1-0.3%. In conclusion, the combination of increased thermal conductivity and dynamic viscosity at a concentration of 0.3% has optimal conditions, which has more advantages for heat transfer than at other concentrations.
Effect of Acid Activation and Al Impregnation in Preparation of Bleaching Earth Catalyst for Glyerol Ketalization Tarmidzi, Fadhil Muhammad; Sa'pangan, Desly Angeline; Adawiyah, Winda Robiatul; Gunawan, Adrian
Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.16.2.225-232

Abstract

Indonesia's increased biodiesel production represents the government's support for implementing replacement strategy of diesel to biodiesel (B30). The consequence's includes a higher production of glycerol as a byproduct. Currently, glycerol's use in Indonesia has remained limited to the pharmaceutical, polymer, and agricultural industries. On the other side, another application for glycerol as a biodiesel additive is being explored. Therefore, glycerol must be valorized in order to promote the development of clean bioenergy in Indonesia. Solketal as biodiesel additive can be produced by ketalizing glycerol with acetone in the presence of catalyst under acidic condition. In this research, a bleaching earth catalyst, one of the components utilized as a bleaching agent in the biodiesel industries, was developed. Bleaching earth is a form of clay with acidic characteristics that makes it an excellent catalyst in the ketalization process. To increase its surface area and active side, it was activated with sulfuric acid and impregnated with aluminum. The XRD and SEM analyses revealed no significant changes in the catalyst, however the IR spectra revealed a drop in the intensity of the Al-O group. The ketalization process was carried out at 60oC for 2 hours with a catalyst load of 1.5% and a glycerol:acetone:ethanol ratio of 1:1:1. The activation process with 15 M sulfuric acid and 1:1 impregnation was able to convert 15.22% glycerol while 1:5 impregnation is 23.73%. In this study, the catalyst load variation was also carried out which also increased the conversion to 60.53% with 5% catalyst load. Based on these results, it shows that the activation process has more effect on glycerol conversion compared to the impregnation process. In addition, the catalyst load in ketalization is also able to increase the conversion of glycerol.
Implementation of Reliability Centered Maintenance (RCM) with Fuzzy Logic in Eliminating Off-Hangar Maintenance on Narrow Body Aircraft Juniawan, Singgih; Jaqin, Choesnul; Prabowo, Herry Agung; Roysen, Uti; Alam, Fachrul; Daruki, Daruki
Jurnal Teknologi Vol 16, No 1 (2024): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.16.1.137-152

Abstract

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%.
Investigation of Heat Exchanger Performance in The Heating Tank Section of Loop FASSIP 03 NT Haryanto, Dedy; Budiman, Arif Adtyas; Putra, Muhammad Ganjar; Setiawan, Putut Hery; Juarsa, Mulya
Jurnal Teknologi Vol 16, No 1 (2024): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.16.1.41-52

Abstract

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.
Analysis of Automatic Voltage Regulator (AVR) Performance Based on Commissioning Load Acceptance and Load Rejection Data at 28 MW Capacity Steam Power Plant Winarto, Agung Tri; Sunardi, Sunardi; Sutikno, Tole
Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.16.2.275-282

Abstract

As the load changes, the voltage produced by the generator will always change due to the fluctuating load.  The output voltage must be kept constant within the desired value to ensure the supply of generator output power in order to meet the needs of the load, then a device called AVR (Automatic Voltage Regulator) is needed. AVR aims to regulate the amount of excitation current supplied to the generator and the amount of excitation current is directly proportional to the amount of voltage produced by the generator. This study aims to analyze the performance of AVR in maintaining the stability of voltage and generator output power at 28 MW Steam Power Plant. Monitoring the performance of the AVR installed on the generator is carried out during commissioning and testing. The test results and analysis after the generator is installed AVR can be seen that the output voltage is in stability with a variation value between 5% of the nominal output voltage value of 11 KV, which shows the success of installing AVR to stabilize the output voltage remains constant and can meet the needs of the load.
Glycosylation Gap in type II diabetes mellitus patients with vitamin D deficiency Alkataan, Muhammad A. Ahmed; Ibrahim, Hayder F.; Altai, Alaa
Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.16.2.187-194

Abstract

Diabetes mellitus represents a major health problem worldwide. DMis usually associated with hypovitaminosis D. Glycosylation is a non-enzymatic process associated with hyperglycemia. This work aims to explore the changes in glycosylation gap and VDR gene expression in type II DM patients with different vitamin D (vit. D) status in Mosul Province. This study recruit 300 subjects visiting Orkida's private laboratory for general screening tests. From May 2020 to August 2021, Only 80 of them fit the inclusion criteria of this work. They were divided into four groups of twenty each Serum fructosamine assay using the NBT-spectrophotometric methods12 and Vit D level estimation by using VIDAS® 25 OH Vitamin D Total - BIOMERIEUX using the Enzyme-Linked Fluorescent Assay (ELF) technique. Cells used for VDR qPCR analysis. The results of this work shows significant reduction in vitamin D levels between the three tested groups (p<0.05) in comparison to control. The glycosylation gap showed a significant elevated in all groups in comparison to the control-group (p<0.01).  significant reduction was noticed in VDR expression in all groups in comparison to the control-group was noticed. VDR expression significantly reduced with elevation in glycosylation gap in both normoglycemic with low Vit D and type II diabetic with sufficient and insufficient vit D group.
The Influence of Work Posture and Work Environment on Sick Building Syndrome in Port Service Company Employees Kinanti, Juwitaning Sekar; Kurniasih, Dewi; Rachmat, Aulia Nadia
Jurnal Teknologi Vol 16, No 1 (2024): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.16.1.95-104

Abstract

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.
IoT Platform for Monitoring Systems Water pH in the Freshwater Fish Cultivation Process Kurnia, Deni; Riyadi, Slamet; Dewi, Deshinta Arrova; Suprianto, Adolf Asih; Rahmadani, Olivia
Jurnal Teknologi Vol 16, No 1 (2024): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.16.1.11-16

Abstract

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. 

Page 27 of 31 | Total Record : 303

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