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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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STUDI PENGEMBANGAN NANOFLUIDA HIJAU BERASAL DARI BAHAN LOKAL ALAM UNTUK APLIKASI DI BIDANG TEKNIK Kushendarsyah Saptaji; Alvika Meta Sari; Anwar Ilmar Ramadhan; Istianto Budhi Rahardja; Muhammad Dadi Saputra; Firmansyah Firmansyah; Efrizon Umar
Jurnal Teknologi Vol 15, No 2 (2023): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.15.2.345-358

Abstract

The increase in energy demand causes a continuous increase in global temperatures exceeding pre-industrial temperatures with the release of toxic gases and radiation causing severe climate conditions. So, it is mandatory to develop durable and highly efficient thermal systems to overcome these problems. There has been much research into nanofluids to improve performance in thermal applications and have gained significant attention over the past few years due to their superior qualities. Additionally, other undesirable effects such as corrosion of equipment, non-biodegradable by-products occur due to the presence of strong chemicals. Therefore, the development of cost-effective and environmentally friendly nanofluids has emerged as a fast-growing alternative research field with many enthusiasts. The current review provides a comprehensive view of the various techniques used in the preparation of green nanofluids using several natural extracts. The unique morphology, optical properties, stability, high surface area, lower toxicity, and improved thermo-physical properties of green nanoparticles make them favorable choice candidates in enhancing the performance of thermal systems.
ANALISIS FAKTOR YANG BERPENGARUH DALAM PENERAPAN KONSEP GREEN PADA BANGUNAN FLOUR MILL PLANT MENGGUNAKAN SEM-PLS Iwan Kurniawan; Albert Eddy Husin
Jurnal Teknologi Vol 15, No 2 (2023): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.15.2.275-286

Abstract

The Main Building of the Flour Mill Plant is the main part of the wheat flour mill consisting of Wheat Bins, Process Area, Finish Bins, Laboratory, and Buck Loading Area. The construction of factory buildings that apply the Green concept is urgently needed, this is to the mission of the Sustainable Development Goals 2030, that by 2030 the new development will have a concept of 100% and an existing building of 60%. To reduce the environmental burden on an industry, it is necessary to build and develop a factory building with a green concept. The Implementation of the Green Concept to the Main Building of the Flour Mill Plant using Structural Equation Modeling – Part Least Square (SEM-PLS). The result of this study is that there are "10 factors that affect the cost performance of the Green Building Flour Mill Plant project", Project Manager Performance, Energy Efficiency, Technical Specifications, Provision of Parking Lots, Management Commitment, Water Sources, Analysis Functions, Waste Handling Systems, Selection of Alternative Materials, and Energy Costs.
SINTESA NANO ZIRKON DARI PASIR ZIRKON LOKAL DENGAN METODE FUSI KAUSTIK SODA-PRESIPITASI-KALSINASI Alvika Meta Sari; Efrizon Umar; Djoko Hadi Prajitno; Rian Fitriana; Anwar Ilmar Ramadhan; Firmansyah Firmansyah; Istianto Budhi Rahardja; Akmal Imam Faisal; Fikriyansyah Fikriyansyah
Jurnal Teknologi Vol 15, No 2 (2023): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.15.2.189-198

Abstract

Indonesia is one of countries that has the potential of mineral natural resources in the form of zircon sand. Zircon sand is a raw material that has the potential to be synthesized into nano zircon because of its ingredients of zircon oxide (ZrO2). In this study the aim was to study the aim to synthesize nano zircon from local zircon sand from Kalimantan using caustic soda-precipitation-calcination modification method. Nano zircon was prepared in this study by modifying existing methods, namely caustic fusion, washing, acid leaching using hydrochloric acid, precipitation using ammonia and calcination processes to produce nano zircon in the form of white powder. The efficiency of the process was analyzed by calculating the yield of the product formed, then the FTIR (Fourier Transform Infra-Red) spectroscopic test was performed to determine the functional groups of nano zircons and the morphology was analyzed using SEM (Scanning Electron Microscopy). Yield obtained is 2.7%  with the size of nano zircon is 41.983 nm. The FTIR spectrum shows the presence of the-Zr-O2 functional group at wave numbers 600 – 700 cm-1.
PENGARUH ALGINAT SEBAGAI EDIBLE COATING TERHADAP KUALITAS BUAH POTONG KLIMAKTERIK: KAJIAN PUSTAKA Armina Meikyo Puspitasari; Hermawan Seftiono
Jurnal Teknologi Vol 15, No 2 (2023): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.15.2.305-314

Abstract

The effect of alginate on the quality of climacteric fresh cut fruits stored in refrigerator temperatures (2–5 °C) for 12–16 days was studied. The control (uncoated) and coated with alginate with various concentrations based on this study were analyzed their the physical (weight loss, texture, and color), chemical (pH, total soluble solids content, and titratable acidity), microbiological (total plate count and yeast and mold), and sensory characteristics. Weight loss and texture analysis showed that 1.5% alginate could inhibiting weight loss and maintaining hardness in fresh cut apple. Color analysis showed that 2% alginate could inhibiting °hue rate, that slowing color changes in fresh cut papaya. Analysis of pH, total soluble solids content, and titratable acidity showed that 2% alginate can maintaining pH value of fresh cut apricot, delaying of sugar utilization as substrate in respiration of fresh cut papaya, and maintaining organic acid in fresh cut kiwi. Total plate count and mold and yeast analysis showed that 1% alginate could inhibiting contamination of fresh cut watermelon and inhibiting the growth of mold and yeast in fresh cut yellow melon. Sensory evaluation analysis showed that 2% alginate could maintaining sensory characteristics in fresh cut guava. Alginate was effectively reduced respiration rate, transpiration, lowering of organic acids utilization, and inhibiting the growth of bacteria, mold and yeast until 12 days. Based on 25 studies 1.5% alginate plays a role in physical parameter (weight loss and texture). 2% Alginate plays a role in chemical parameters and 1% alginate inhibiting microorganism.
FLEXURAL STRENGTH OF PINEAPPLE LEAF FIBER REINFORCED METAKAOLIN ZIRCONIA CARBONATE APATITE GEOPOLYMER COMPOSITE Andrie Harmaji; Susanti Nurfadhila; Bambang Sunendar
Jurnal Teknologi Vol 15, No 2 (2023): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.15.2.237-246

Abstract

Developments in the materials engineering have encouraged the incorporation of minerals such as kaolin, zirconia, and carbonate apatite, and natural materials. Indonesia, which has a tropical climate, is overgrown with pineapple plants. Geopolymer is a brittle ceramic material so it is necessary to increase its flexural strength value for composite application. Pineapple leaf fiber can be used as reinforcement in geopolymer composites. This study aims to analyze the effect of adding pineapple leaf fiber (Ananas comosus (L.) Merr.) to the mechanical properties and morphological characteristics of metakaolin-zirconia-carbonate apatite-based geopolymer composites. The use of chitosan coupling agent as a binder between the matrix and filler. The research sample consisted of 4 groups with a total of 5 samples in each group. Fiber varied 0-4% in Geopolymer Composites. Geopolymer Composite samples were tested for flexural strength and Scanning Electron Microscope (SEM). The test results showed that the addition of pineapple leaf fiber increased the flexural strength of the geopolymer composite. The composite without the addition of fiber had a flexural strength of 11.24 MPa, while the addition of 1%, 2.5%, and 4% pineapple fiber resulted in a flexural strength of 20.71 MPa, 11.57 MPa, and 11.01 MPa. The results of the SEM test show a picture of the void with varying sizes. The SEM Images of composite with the addition of 4% pineapple fiber showed the formation of Na2CO3 which explained the decrease in flexural strength compared to the sample without pineapple fiber addition.
Optimization of Manufacturing Company's Production Process Using Lean Six Sigma Fortuna, Dhea; Yuliawati, Evi
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.16.2.213-224

Abstract

In the manufacturing industry, product quality is the main focus. Companies must ensure products meet quality standards. PT. Preshion Engineering Plastec Surabaya is a company that produces plastec supporting components. The object of this study is Yamaha emblem assy products. With Lean six sigma using DMAIC (Define, Measure, Analyze, Improve, Control) methodology to improve production processes. In addition, it improves the efficiency and effectiveness of the production process, improves product quality. The emblem assy product from CTQ shows that there are 4 defects that occur, namely outgoing rays, dirty, shin marks, and short mold. So that the DPMO (Defect Per Million Opportunies) value from January to March 2023 is 159784.715 with an average of 13315.39 and produces a sigma value of 45.0011 with an average of 3.75. Identification of the root causes of defects in Emblem assy products that are dominant with fishbone diagrams, namely dirty injection machines and material mixing machines, old machine age. It is hoped that further research can identify the factors that cause product defects with broader and more significant aspects to be used.
The Influence of Job Stress and Psychosocial Factors on Employee Performance through Leadership Quality Afifah, Zumrotin Nur; Kurniasih, Dewi; Rachman, Farizi
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.16.1.127-136

Abstract

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%.
Flettner Rotor Implication on Ship Ferry The Kalianget-Kagean Route Using Computational Fluid Dynamics Firdausyah, Akmal; Munazid, Ali; Pambudi, Prastyono Eko; Suwasono, Bagiyo
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.16.1.33-40

Abstract

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 (CL) of 3.647 and a lift force (Fl) 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%.
Analysis of Gangway Noise Influence On Interior Noise Of K1 Stainless Steel Train Dyah, Ainun Purwining; Salim, Alfi Tranggono Agus; Apriyanto, R. Akbar Nur; Nurdiansyah, Rahardian Titus; Hibbanurrohim, Muhammad Ibram; Hakiki, Zahrani Aniela
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.16.2.267-274

Abstract

Noise is caused by uncontrollable sounds affected by public health problems and listener discomfort. The research problem is the noise from the gangway to the interior noise of the K1 stainless steel train in evaluating comfort on the train. This research aims to analyze the acoustic characteristics of the gangway and the noise insulation of the gangway based on the value of the sound transmission class. The research method is a quantitative experiment the measures the acoustic parameters of the static K1 stainless steel train at a height of 1.2 m from the floor using a microphone that has units of dB. The study results are the transmission loss (TL) value in the gangway 43.3 dB, the FSTC value in the gangway 15, 11, 18, 23, and the STC value from the simulation results 22. The conclusion of the study is the STC value in the gangway from the calculation results and simulation results based on value classification STC in the ASTM E413-16 standard is categorized as low insulation with a low sound of 20-25.
Minimizing Production Costs Through Aggregate Production Planning with Compromise Strategy in the Food Industry Saputra, Dafid Mega; Hernadewita, Hernadewita; Hendra, Hendra
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.16.2.179-186

Abstract

The food industry is required to carry out production efficiency by minimizing production costs and maintaining competitiveness in the market. One approach that has proven effective in optimizing the production process is through the application of aggregate production planning. This research aims to design a compromise production planning strategy by considering various factors that influence production costs in the food industry, achieve efficiency, and reduce production costs significantly. This research uses an aggregate production method through a compromise strategy model approach to order data for a year. The research results showed that there were two production planning alternatives, namely the first alternative is variable constant labour with overtime, required additional production costs of IDR 338,080,241, while the second alternative is workforce variations, required additional production costs of IDR 301,229,167. The second production alternative can be chosen to be implemented in production planning due to it requires lower costs. Through this study, it is expected that it can provide a valuable contribution to practitioners and academics in understanding the important role of aggregate production planning in achieving production cost efficiency goals in the food industry

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